I have collected everything of mine that could be found - I looked on the internet and used a few techniques for finding hidden objects, like making invisible things visible and turning everything into a wire frame 'shift-clrt-alt-r' and still nothing. I just cant see where they are or even what they are.
Saying that I do remember about a week ago some items went missing from my inventory, now wether that has anything to do with it I don't know.