Did the experiment take into consideration - Coin Thieves? Anyway, I've listed this coin as missing, location unknown. The coin hasn't been reported as seen since it was placed in my for Premium Member Only Cache back in June. One can only assume that: (1) the coin was never placed in the cache, or (2) the cache was visited by someone that did not log being at the cache and not log the coin out of the cache. Not much we can do about coin thieves other than not provide them with coins to steal. Sorry about your coin. I've lost several myself. That's why I came up with the idea of creating caches for Premium Members Only. Thought that maybe it would cut back on coins coming up missing because they were grabbed by non paying geocachers. So far, I've experience two coins missing from my Premium Member Caches. The other coin was in another cache in the same park. Any relation? Who knows? Anyway, sorry again, maybe the coin will show up in the Geocaching circuit some day. Doubt it though.