Just died to an Alpha and when I retrieved my corpse the only items I could loot were the things I was wearing, the stuff on my bar and anything NOT in a folder. The items that were in the folder were not on my body are all. It wasn't until I chopped up my own corpse that a bag appeared that contained all of my other things that were IN a folder previously.
If I didn't have a pick axe on me I would probably not have bothered to chop my corpse up and would have lost al that stuff.