Loot Box Problem

It just switches what you selected to take with whatever is stored in the bag slot you decided to exchange that for.

If you press and hold light ammo, and select a stack of 80 heavy ammo, you will just swap that 80 heavy for 80 light. You cannot see items dropping on the floor since they're put in the deathbox instead of what you took.

There is no need to show you what you loot or drop, since you already have eyes on what you loot and drop from deathbox and inventory menu.

I really don't understand your issue with not "seeing" what you pick up and drop since you already do.