When looting corpses, items moved from one inventory to another appear in both locations.
The items remain on the corpse in some capacity. I removed an item from a corpse and placed it in my inventory. The item appeared in both mine and the dead player's inventories. A second player was then asked to loot the corpse. When he removed the same item I had removed, it disappeared from my inventory and appeared in both the second player's and the corpse's inventories.
Thank you!
Loot corpse, monitor inventory for mirrored items. If possible have a second player then loot the same item from the corpse and monitor all three inventories.
I can confirm this issue. It also occurs with hats. Player A loots and wears hat from Corpse B, Player C loots same hat from Corpse B, Player A looses hat.
From the forums, link to a video showing the issue with a backpack:
http://www.youtube.com/watch?feature=player_detailpage&v=g6rHlln-ab8#t=49
Notice how the contents of both "copies" update at the same time.