I have a few dozen 50 cal ammo cans. M2A1. USGI surplus. these cans look AMAZING. hardly any wear marks, some i can hardly tell were used before. all of them came from the US govt. they have soft rubber gaskets and are new production surplus ammo cans 

these cans have date codes 2011-2016. This means the cans are not only in great condition but that the ribber gasket will seal out moisture and water for decades to come.