Before the Jan 22nd patch, you could empty Magazines on the floor,and the ammo would go straight to your Ammo box. Now it totally disappears. It's not on the floor, nor in my inventory or my man Protector cases.
In addition, when you empty a Mag in your inventory, you often lose ammo. I've lost 6-10rnds from a 60rnd clip. I've even gained an extra 20rnds from a 10rnd clip totaling to 30rnds (from that single 10rnd clip..