Need a model - Treasure Chest

Need a model - Treasure Chest

Only a modification of the original Treasure Chest, that has a Closed animation and an opening animation. I don't think it's too hard, but I can't know.

Already thanks
Marcelo

if I am correct (but I can be mistaken), there is already a model like that one on this website

http://wc3sear.ch/index.php?p=Models&ID=344&sid=413439d95a65c524bba05f6314824de3
There you go!