Code
import player, event, net ,chr ,char ,chat,net
SLOT_COUNT = player.INVENTORY_PAGE_COUNT*player.INVENTORY_PAGE_SIZE
ORG_CHAT_PACKET = net.SendChatPacket
for i in xrange(SLOT_COUNT):
if player.GetItemIndex(i) == ITEMID:
net.SendItemUsePacket(i)
#if you want to open more with one click. Just copy the "net.SendItemUsePacket(i)" and paste.
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#thank you 123klo