Picked up an Ammo Box from a heli crash, filled it with items and stored it in my backpack.
After a while all the items inside the Ammo Box disappeared.
This happened twice, and I did re-connect to the server twice, not sure if it is related. or they just disappeared after some time (30-45 min)
1st time the box contained a frying pan and ammo
2nd time the box contained various mags and ammo