I have desperately attempted to find ammo boxes in prisons and barracks. After 10 prisons and barracks I had to admit that there was NO AMMO BOXES in the game, or rather that they became INVISIBLE. I deleted the player.vars file and found an ammo box immediately after that. Something like that already happened to me a few weeks ago with the ACOG in my inventory.
In only three days of gaming (I hadn't played for 3 weeks because of character reset) I also managed to get attacked on the third floor of offices by zombies on the first floor, I lost my Mosin that I had to drop a few seconds because of server crash, I lost 2 full yellow boxes which disappeared from the inventory, I ruined my TTSKO pants by walking (no fall) in the offices (my legs and the stuff inside were fine), I managed to walk while being unconscious and until a friend revived me.