[2022] Looting Question

Anything lootable that vanishes after looting, the way ammo or medical piles do, do not respawn. Anything lootable that remains after being looted can respawn loot; Doesn't matter what size or shape they are.

If you can still interact with it to open a loot window, It'll respawn loot if you stay away from it for the duration of the loot respawn timer.