The ones I can recall right now:
                Guitar strings, cigarettes, hash, other drugs (always flushed down the toilet), several wrist watches, a new pair of boots, sweets, rolls, bread, cans and bottles of beer and soft drinks, jewellery, a social security voucher for a visit to a Hamburg brothel (where was that when I needed it?), chips, coins from more lands than I have ever heard of, fruit, vegetables, flowers, cassettes, pens, personalised writing paper, penknives, invitations, letters, pamphlets from all sorts of strange religious groups, guitar picks boxes and bars of chocolates, books, a bomber jacket, photographs...
      I'll probably recall some more later. I wonder what Larry and Steve Rich will add to this thread?