Yeah, I used to bring items along to the coin club and then when I got back late from the meeting I would just put them somewhere safe until I could put them back in the albums where they came from.
Just found a whole load of rounds recently, I hadn't lost them as such, I wasn't even aware that they were not back in the albums, I just plain forgot about them.
My brother-in-law on the other hand stashed a load of banknotes within the pages of a book for safe keeping...