Way More Ammo Than Any Civilian Needs

Things got a lot more serious after Jerry opened the crates. Hidden in the room was an SKS air rifle, crates of blank ammo, two crates of rifle ammo, a box of 19mm military-grade ammo, a box of 8mm ammo, boxes of Wolf 39mm ammo, and a dead grenade.
That’s a lot of ammo for an old man. Why was it hidden away? The weirdest part is that Jerry’s strangest discovery is the most harmless.