QSL cards for caches?? in Ham Radio Posted July 10, 2002 Letter boxing in England is an "exchange" of stamps. The one finding the cache places his/her stamp in the cache log book and the cache stamp is placed in the finders log book too. It's rather fun to look through your stamps and see where you've been. Youth hostel stamps are fund to brouse through too after a trip. Why not add this feature to geocaching--at least make the possibility for those who want to do it?