NPC que da Storage quando Vender

Estou usando OTX 8.60. 
Gostaria de saber como eu faço para que toda vez que o jogador venda um ITEM pelo Shop do NPC ele recebá uma Storage qualquer.  Para exemplificar melhor, vemos que no código abaixo o ITEM Wand of Vortex pode ser vendida do jogador para o NPC. 

 shopModule:addSellableItem({'wand of vortex', 'vortex'}, 2190, 250, 'wand of vortex')

Gostaria que assim que ele aceitasse fazer a venda de sua WAND, o jogador recebesse uma Storage XXXX. 

 local keywordHandler = KeywordHandler:new()
local npcHandler = NpcHandler:new(keywordHandler)
NpcSystem.parseParameters(npcHandler)
local talkState = {}

function onCreatureAppear(cid)				npcHandler:onCreatureAppear(cid)			end
function onCreatureDisappear(cid) 			npcHandler:onCreatureDisappear(cid)			end
function onCreatureSay(cid, type, msg)			npcHandler:onCreatureSay(cid, type, msg)		end
function onThink()					npcHandler:onThink()					end

local shopModule = ShopModule:new()
npcHandler:addModule(shopModule)

shopModule:addBuyableItem({'spellbook'}, 2175, 1222, 'spellbook')
shopModule:addBuyableItem({'magic lightwand'}, 2163, 400, 'magic lightwand')

shopModule:addBuyableItem({'small health'}, 8704, 20, 1, 'small health potion')
shopModule:addBuyableItem({'health potion'}, 7618, 45, 1, 'health potion')
shopModule:addBuyableItem({'mana potion'}, 7620, 50, 1, 'mana potion')
shopModule:addBuyableItem({'strong health'}, 7588, 60, 1, 'strong health potion')
shopModule:addBuyableItem({'strong mana'}, 7589, 60, 1, 'strong mana potion')
shopModule:addBuyableItem({'great health'}, 7591, 80, 1, 'great health potion')
shopModule:addBuyableItem({'great mana'}, 7590, 80, 1, 'great mana potion')
shopModule:addBuyableItem({'great spirit'}, 8472, 150, 1, 'great spirit potion')
shopModule:addBuyableItem({'ultimate health'}, 8473, 210, 1, 'ultimate health potion')
shopModule:addBuyableItem({'antidote potion'}, 8474, 50, 1, 'antidote potion')

shopModule:addSellableItem({'normal potion flask', 'normal flask'}, 7636, 5, 'empty small potion flask')
shopModule:addSellableItem({'strong potion flask', 'strong flask'}, 7634, 10, 'empty strong potion flask')
shopModule:addSellableItem({'great potion flask', 'great flask'}, 7635, 15, 'empty great potion flask')

shopModule:addBuyableItemContainer({'bp blank'}, 1998, 2260, 220, 1, 'backpack of blank runes')
shopModule:addBuyableItemContainer({'bp animate dead'}, 1998, 2316, 7520, 1, 'backpack of animate dead runes')
shopModule:addBuyableItemContainer({'bp antidote'}, 2003, 2266, 1320, 1, 'backpack of antidote runes')
shopModule:addBuyableItemContainer({'bp avalanche'}, 2002, 2274, 3620, 1, 'backpack of avalanche runes')
shopModule:addBuyableItemContainer({'bp chameleon'}, 1998, 2291, 4220, 1, 'backpack of chameleon runes')
shopModule:addBuyableItemContainer({'bp convince creature'}, 1998, 2290, 1620, 1, 'backpack of convince creature runes')
shopModule:addBuyableItemContainer({'bp desintegrate'}, 2001, 2310, 1620, 1, 'backpack of desintegrate runes')
shopModule:addBuyableItemContainer({'bp destroy field'}, 2003, 2261, 920, 1,  'backpack of destroy fields')
shopModule:addBuyableItemContainer({'bp energy bomb'}, 2003, 2262, 6520, 1, 'backpack of energy bomb runes')
shopModule:addBuyableItemContainer({'bp energy field'}, 1998, 2277, 2320, 1, 'backpack of energy fields')
shopModule:addBuyableItemContainer({'bp energy wall'}, 2002, 2279, 6820, 1, 'backpack of energy wall runes')
shopModule:addBuyableItemContainer({'bp explosion'}, 2001, 2313, 3820, 1, 'backpack of explosion runes')
shopModule:addBuyableItemContainer({'bp fire bomb'}, 2000, 2305, 4720, 1, 'backpack of fire bomb runes')
shopModule:addBuyableItemContainer({'bp fire field'}, 2000, 2301, 1720, 1,  'backpack of fire field runes')
shopModule:addBuyableItemContainer({'bp fire wall'}, 2000, 2303, 4920, 1, 'backpack of fire wall runes')
shopModule:addBuyableItemContainer({'bp fireball'}, 2000, 2302, 3020, 1,  'backpack of fire balls')
shopModule:addBuyableItemContainer({'bp great fireball'}, 2000, 2304, 3620, 1, 'backpack of great fireball runes')
shopModule:addBuyableItemContainer({'bp heavy magic missile'}, 2001, 2311, 2420, 1, 'backpack of heavy magic missile runes')
shopModule:addBuyableItemContainer({'bp holy missile'}, 1999, 2295, 1600, 1, 'backpack of holy missile runes')
shopModule:addBuyableItemContainer({'bp icicle'}, 2002, 2271, 3020, 1, 'backpack of icicle runes')
shopModule:addBuyableItemContainer({'bp intense healing'}, 2003, 2265, 1920, 1, 'backpack of intense healing runes')
shopModule:addBuyableItemContainer({'bp light magic missile'}, 1998, 2287, 820, 1, 'backpack of light magic missile runes')
shopModule:addBuyableItemContainer({'bp magic wall'}, 1999, 2293, 7020, 1, 'backpack of magic wall runes')
shopModule:addBuyableItemContainer({'bp paralyze'}, 2002, 2278, 13350, 1, 'backpack of paralyze runes')
shopModule:addBuyableItemContainer({'bp poison bomb'}, 1998, 2286, 3420, 1, 'backpack of poison bomb runes')
shopModule:addBuyableItemContainer({'bp poison field'}, 1998, 2285, 1320, 1,  'backpack of poison field runes')
shopModule:addBuyableItemContainer({'bp poison wall'}, 1998, 2289, 4220, 1, 'backpack of poison wall runes')
shopModule:addBuyableItemContainer({'bp soulfire'}, 2000, 2308, 2820, 1, 'backpack of soulfire runes')
shopModule:addBuyableItemContainer({'bp stalagmite'}, 1998, 2292, 2400, 1, 'backpack of stalagmite runes')
shopModule:addBuyableItemContainer({'bp stone shower'}, 1999, 2288, 3020, 1, 'backpack of stoneshower runes')
shopModule:addBuyableItemContainer({'bp sudden death'}, 2003, 2268, 6520, 1, 'backpack of sudden death runes')
shopModule:addBuyableItemContainer({'bp thunderstorm'}, 1999, 2315, 3020, 1, 'backpack of thunderstorm runes')
shopModule:addBuyableItemContainer({'bp ultimate healing'}, 2002, 2273, 3520, 1, 'backpack of ultimate healing runes')
shopModule:addBuyableItemContainer({'bp wild growth'}, 2002, 2269, 6420, 1, 'backpack of wild growth runes')

shopModule:addBuyableItem({'blank rune'}, 2260, 10, 1, 'blank rune')
shopModule:addBuyableItem({'animate dead'}, 2316, 375, 1, 'animate dead rune')
shopModule:addBuyableItem({'antidote'}, 2266, 65, 1, 'antidote rune')
shopModule:addBuyableItem({'avalanche'}, 2274, 180, 1, 'avalanche rune')
shopModule:addBuyableItem({'chameleon'}, 2291, 210, 1, 'chameleon rune')
shopModule:addBuyableItem({'convince creature'}, 2290, 80, 1, 'convince creature rune')
shopModule:addBuyableItem({'desintegrate'}, 2310, 80, 1, 'desintegrate rune')
shopModule:addBuyableItem({'destroy field'}, 2261, 45, 1,  'destroy field')
shopModule:addBuyableItem({'energy bomb'}, 2262, 325, 1, 'energy bomb rune')
shopModule:addBuyableItem({'energy field'}, 2277, 115, 1, 'energy field')
shopModule:addBuyableItem({'energy wall'}, 2279, 340, 1, 'energy wall rune')
shopModule:addBuyableItem({'explosion'}, 2313, 190, 1, 'explosion rune')
shopModule:addBuyableItem({'fire bomb'}, 2305, 235, 1, 'fire bomb rune')
shopModule:addBuyableItem({'fire field'}, 2301, 85, 1,  'fire field rune')
shopModule:addBuyableItem({'fire wall'}, 2303, 245, 1, 'fire wall rune')
shopModule:addBuyableItem({'fireball'}, 2302, 150, 1,  'fire ball')
shopModule:addBuyableItem({'great fireball'}, 2304, 180, 1, 'great fireball rune')
shopModule:addBuyableItem({'heavy magic missile'}, 2311, 120, 1, 'heavy magic missile rune')
shopModule:addBuyableItem({'holy missile missile'}, 2295, 80, 1, 'holy missile rune')
shopModule:addBuyableItem({'icicle'}, 2271, 150, 1, 'icicle rune')
shopModule:addBuyableItem({'intense healing'}, 2265, 95, 1, 'intense healing rune')
shopModule:addBuyableItem({'light magic missile'}, 2287, 40, 1, 'light magic missile rune')
shopModule:addBuyableItem({'magic wall'}, 2293, 200, 1, 'magic wall rune')
shopModule:addBuyableItem({'paralyze'}, 2278, 250, 1, 'paralyze rune')
shopModule:addBuyableItem({'poison bomb'}, 2286, 170, 1, 'poison bomb rune')
shopModule:addBuyableItem({'poison field'}, 2285, 65, 1,  'poison field')
shopModule:addBuyableItem({'poison wall'}, 2289, 210, 1, 'poison wall rune')
shopModule:addBuyableItem({'soulfire'}, 2308, 140, 1, 'soulfire rune')
shopModule:addBuyableItem({'stalagmite'}, 2292, 120, 1, 'stalagmite rune')
shopModule:addBuyableItem({'stone shower'}, 2288, 150, 1, 'stoneshower rune')
shopModule:addBuyableItem({'sudden death'}, 2268, 50, 1, 'sudden death rune')
shopModule:addBuyableItem({'thunderstorm'}, 2315, 150, 1, 'thunderstorm rune')
shopModule:addBuyableItem({'ultimate healing'}, 2273, 175, 1, 'ultimate healing rune')
shopModule:addBuyableItem({'wild growth'}, 2269, 320, 1, 'wild growth rune')

shopModule:addBuyableItemContainer({'bp slhp'}, 2000, 8704, 400, 1, 'backpack of small health potions')
shopModule:addBuyableItemContainer({'bp hp'}, 2000, 7618, 900, 1, 'backpack of health potions')
shopModule:addBuyableItemContainer({'bp mp'}, 2001, 7620, 1000, 1, 'backpack of mana potions')
shopModule:addBuyableItemContainer({'bp shp'}, 2000, 7588, 2000, 1, 'backpack of strong health potions')
shopModule:addBuyableItemContainer({'bp smp'}, 2001, 7589, 1600, 1, 'backpack of strong mana potions')
shopModule:addBuyableItemContainer({'bp ghp'}, 2000, 7591, 3800, 1, 'backpack of great health potions')
shopModule:addBuyableItemContainer({'bp gmp'}, 2001, 7590, 2400, 1, 'backpack of great mana potions')
shopModule:addBuyableItemContainer({'bp gsp'}, 1999, 8472, 3800, 1, 'backpack of great spirit potions')
shopModule:addBuyableItemContainer({'bp uhp'}, 2000, 8473, 6200, 1, 'backpack of ultimate health potions')
shopModule:addBuyableItemContainer({'bp ap'}, 2002, 8474, 2000, 1, 'backpack of antidote potions')

shopModule:addBuyableItem({'wand of vortex', 'vortex'}, 2190, 500, 'wand of vortex')
shopModule:addBuyableItem({'wand of dragonbreath', 'dragonbreath'}, 2191, 1000, 1, 'wand of dragonbreath')
shopModule:addBuyableItem({'wand of decay', 'decay'}, 2188, 2000, 1, 'wand of decay')
shopModule:addBuyableItem({'wand of draconia', 'draconia'}, 8921, 3000, 1, 'wand of draconia')
shopModule:addBuyableItem({'wand of cosmic energy', 'cosmic energy'}, 2189, 4000, 1, 'wand of cosmic energy')
shopModule:addBuyableItem({'wand of inferno', 'inferno'}, 2187, 5000, 1, 'wand of inferno')
shopModule:addBuyableItem({'wand of starstorm', 'starstorm'}, 8920, 6000, 1, 'wand of starstorm')
shopModule:addBuyableItem({'wand of voodoo', 'voodoo'}, 8922, 7000, 1, 'wand of voodoo')

shopModule:addBuyableItem({'snakebite rod', 'snakebite'}, 2182, 500, 1, 'snakebite rod')
shopModule:addBuyableItem({'moonlight rod', 'moonlight'}, 2186, 1000, 1, 'moonlight rod')
shopModule:addBuyableItem({'necrotic rod', 'necrotic'}, 2185, 2000, 1, 'necrotic rod')
shopModule:addBuyableItem({'northwind rod', 'northwind'}, 8911, 3000, 1, 'northwind rod')
shopModule:addBuyableItem({'terra rod', 'terra'}, 2181, 4000, 1, 'terra rod')
shopModule:addBuyableItem({'hailstorm rod', 'hailstorm'}, 2183, 5000, 1, 'hailstorm rod')
shopModule:addBuyableItem({'springsprout rod', 'springsprout'}, 8912, 6000, 1, 'springsprout rod')
shopModule:addBuyableItem({'underworld rod', 'underworld'}, 8910, 7000, 1, 'underworld rod')

shopModule:addSellableItem({'wand of vortex', 'vortex'}, 2190, 250, 'wand of vortex')
shopModule:addSellableItem({'wand of dragonbreath', 'dragonbreath'}, 2191, 500, 'wand of dragonbreath')
shopModule:addSellableItem({'wand of decay', 'decay'}, 2188, 1000, 'wand of decay')
shopModule:addSellableItem({'wand of draconia', 'draconia'}, 8921, 2000, 'wand of draconia')
shopModule:addSellableItem({'wand of cosmic energy', 'cosmic energy'}, 2189, 3000, 'wand of cosmic energy')
shopModule:addSellableItem({'wand of inferno', 'inferno'},2187, 4000, 'wand of inferno')
shopModule:addSellableItem({'wand of starstorm', 'starstorm'}, 8920, 5000, 'wand of starstorm')
shopModule:addSellableItem({'wand of voodoo', 'voodoo'}, 8922, 6000, 'wand of voodoo')

shopModule:addSellableItem({'snakebite rod', 'snakebite'}, 2182, 250,'snakebite rod')
shopModule:addSellableItem({'moonlight rod', 'moonlight'}, 2186, 500, 'moonlight rod')
shopModule:addSellableItem({'necrotic rod', 'necrotic'}, 2185, 1000, 'necrotic rod')
shopModule:addSellableItem({'northwind rod', 'northwind'}, 8911, 2000, 'northwind rod')
shopModule:addSellableItem({'terra rod', 'terra'}, 2181, 3000, 'terra rod')
shopModule:addSellableItem({'hailstorm rod', 'hailstorm'}, 2183, 4000, 'hailstorm rod')
shopModule:addSellableItem({'springsprout rod', 'springsprout'}, 8912, 5000, 'springsprout rod')
shopModule:addSellableItem({'underworld rod', 'underworld'}, 8910, 6000, 'underworld rod')

local items = {[1] = 2190, [2] = 2182, [5] = 2190, [6] = 2182}
function creatureSayCallback(cid, type, msg)
	if(not npcHandler:isFocused(cid)) then
		return false
	end

	local talkUser = NPCHANDLER_CONVBEHAVIOR == CONVERSATION_DEFAULT and 0 or cid
	if(msgcontains(msg, 'first rod') or msgcontains(msg, 'first wand')) then
		if(isSorcerer(cid) or isDruid(cid)) then
			if(getPlayerStorageValue(cid, 30002) <= 0) then
				selfSay('So you ask me for a {' .. getItemNameById(items[getPlayerVocation(cid)]) .. '} to begin your advanture?', cid)
				talkState[talkUser] = 1
			else
				selfSay('What? I have already gave you one {' .. getItemNameById(items[getPlayerVocation(cid)]) .. '}!', cid)
			end
		else
			selfSay('Sorry, you aren\'t a druid either a sorcerer.', cid)
		end
	elseif(msgcontains(msg, 'yes')) then
		if(talkState[talkUser] == 1) then
			doPlayerAddItem(cid, items[getPlayerVocation(cid)], 1)
			selfSay('Here you are young adept, take care yourself.', cid)
			setPlayerStorageValue(cid, 30002, 1)
		end
		talkState[talkUser] = 0
	elseif(msgcontains(msg, 'no') and isInArray({1}, talkState[talkUser])) then
		selfSay('Ok then.', cid)
		talkState[talkUser] = 0
	end

	return true
end

npcHandler:setCallback(CALLBACK_MESSAGE_DEFAULT, creatureSayCallback)
npcHandler:addModule(FocusModule:new())

Obrigado desde já pela ajuda.