WowAce

http://www.wowhead.com/item=147867/pilfered-sweeper

["Pilfered Sweeper"] = { cat = LEGION, type = ITEM, isToy = true, method = SPECIAL, name = L["Pilfered Sweeper"], itemId = 147867, chance = 100, coords = {{m=1021,x=47.8,y=67.3}} },

The coords are the entrance to the cave with all the chests. You can add them to Scraps as well.

Don't forget to edit the special detection in core.lua

-- Handle opening Curious Wyrmtongue Cache
if fishing and opening and lastNode and (lastNode == L["Curious Wyrmtongue Cache"]) then
  	local names = {"Scraps", "Pilfered Sweeper"}
	for _, name in pairs(names) do
		local v = self.db.profile.groups.items[name]
		if v and type(v) == "table" and v.enabled ~= false then
			if v.attempts == nil then v.attempts = 1 else v.attempts = v.attempts + 1 end
			self:OutputAttempts(v)
		end
	end
end