I think the top one is in Bone Villiage. -EDIT- its not, sorry. I've seen it recently though.The Blue one is in the Shop in the Shinra Building.The third one...not sure. Maybe in the Ancient Temple?
I like this a lot so far. My only is with the textures on the gold chest. The metal mesh seems to be too complex in a small area making it easier to dislike than be appreciated. I feel similarly for the gold and red textures but those aren't as noticeable. K.I.S.S. The rest of the chests look perfect.