I don't have many geocoins travelling in the wild probably 12 or so, 3 went missing in 2006 and I marked them as lost/stolen. Recently 2 of the lost/stolen coins appeared out of nowhere both in the same week. One coin had been missing for over 6 months and the other 9 months. You never know when coins may pop up back in circulation. I'm planning on releasing a few more coins this Spring, and will be sure to drill a hole and tag them, something I've been reluctant to due in the past. One note, all of my coins travelling over in Europe are still going strong and tend to be moved from cache to cache once every week or two.