So i found something rather useful today..
Potion's of Treasure finding work on Firelands raid trash, and i've been getting a ridiculous amount of chests
in 20 mins of trash farming, i got 8 chests so far..
The trick is, probably 6 of them came off of other people's loot, especially the little scorpions, so wait for whoever to loot them, and you should see the loot icon pop up for you =]