Yeah, this seems to be turning into a big problem. Of the last SEVEN travel bugs that should have been in caches I found, none of them were present and none of them had been logged as retrieved. Some of them have been MIA for years. I think geocaching.com needs to do something: education for new users, education for purchasers of TBs (make it clear that when a bug goes missing, they should indicate the fact so it doesn't show as supposed to be somewhere it hasn't been for a while), maybe some form of oversight, or ability for a person who found the cache w/o the TB to record it as missing.