>>212194381I actually have no idea but the ammo looks a bit too beefy for 5.56. It looks like 7.62 NATO rounds, and there's a mix of other rounds in there too, with some occasional clips of what look like 8mm mauser rounds.
I did a reverse image search and most results are in Cyrillic, so I thought East Europe/RUssia, but most of those countries use steel case, not brass. Only Brass soviet era ammo maker is Yugoslavia, so maybe it's from the Yugoslav balkan wars.
But wait, the background nature doesn't look Balkan at all. It's more southern and tropical. Huh?