ammo boxes

An ammunition box or cartridge box is a container designed for safe transport and storage of ammunition. It is typically made of metal, wood, and corrugated fiberboard, etc. Boxes are labelled with caliber, quantity, and manufacturing date, lot number, UN dangerous goods labels.
With a metal container, rubber gasket is commonly found in the hinged lid to protect the ammunition from moisture damage. With other containers, plastic bags and desiccants can be used.
The resealing ammunition box is largely a NATO tradition. Warsaw Pact nations typically stored and transported ammunition in single-use "spam cans". They had crates that had a sealed zinc lining on the inside.

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