See the code:
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chests = {
	["1"] = {
		xPos = 6,
		yPos = 4,
		items = {10,30},
		chance = 40,
		delay = 30
	},
	["2"] = {
		xPos = 18,
		yPos = 12,
		items = {45,69},
		chance = 20,
		delay = 60	}
}
addhook("use","t_use")
function t_use(id)
	local r = math.random(0,100)
	for k,v in pairs(chests) do
		if player(id,"tilex")==chests[k].xPos and player(id,"tiley")==(chests[k].yPos+1) then
				if r <= chests[k].chance then
					local it = math.random(1,#chests[k].items)
					msg2(id,"You gained a weapon "..chests[k].items[it])
					parse("equip "..id.." "..chests[k].items[it])
				else
					msg2(id,"Empty")
				end
		end
	end
end
Add delay to a use
1 
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The Smoker