On the television show 'Pawn Stars', there was an original one of these iron chests that was given an auction value of above $10 grand, I believe, but it was a big chest.
On another episode of that same program, a man brought in one made of wood with the intricate locks and key-holes, etc. It turned out to be from India and, although not a 'treasure box', it was used for storing valuables and keeping away thieves, much like your piece, Ibrahiim. It would appear that one pattern influenced another, hey? In any case, these chests were certainly found in castles, keeps, ship's holds (well-founded research) and very probably monasteries as well as merchant's storefronts. All of the examples displayed are envious items in a collection. Wish I had one. Marcus, if you know where one is for that price, buy it for me and I'll pay you back!!
If it's legitimate, I think the auction estimate will be much lower than what it actually sells for.