We seem to be experiencing a rash of Geocoin theft in our area. several jeep travel bugs are still logged in caches but have not been there for months and this month I placed a new travelbug depot cache. Almost every coin that has been placed in the cachen (about 6) has disappeared and not been logged. It doesn't appear to be random because they only take the coins and jeeps. Are there any suggestions on what to do about this, short of not circulating coins?