Hi:
If I recall correctly the .22 Hornet was for a"Survival Rifle" that was an O/U weapon with the top barrel .22 Hornet and the bottom barrel .410 gauge. These were carried on Military Airplanes.

The .45acp Shot Cartridges were also for "Survival" purposes in case of a plane crash.

The 20rd. box of .45acp is a mystery to me, as what we were issued in the military were 50rd brown boxes. The 20rd box might be from the WWI era.
Jimmy