That is amazing. I have let my first two out into the wild, but know not to get too fussed if they disappear. Am watching a teeny tiny one called Small Stakes that my geocaching friend from the UK took back with him - last we saw it was in Sweden, I think, but nothing since - it is in the hands of a thousand-plus cacher though so I imagine it will turn up eventuallY! Guess this is part of the fun!
T