We went to our very first cache near Big Rapids, MI this weekend, expecting to find a geocoin to bring back to our area, only to find that someone did not log online that they had taken the coin. They had a SigSticker in the log book and everything, and their visit was 2 weeks ago, so it's not like they didn't get around to it yet. BIG BUMMER for new cachers!
BTW, who would I mention this to: the offender, the cache owner, or the Geocoin owner?