I had a very special (to me) TB that was MIA for abt 1 1/2 years. It's mission was to go from Hawaii to Michigan. It moved very quickly from Hawaii to California to Idaho to New york. THEN it was taken from a cache in Mass and not logged. I read through the logs and contacted the cachers at that time. One cacher in particular was able to describe it TO A TEE, but 'she did not have it'.
It was a disposable camera for a b'day. Just a few months ago a cacher from Vermont got it at a Geo-event.
He sent it to me (with extra presents for the belated b'day!!!).
As a side note, on the developed pics was a pic of two brothers. Since the pic was taken one had passed away and that turned out to be the last pic taken of his brother. So it has a bittersweet ending.
I have reincarnated that bug and dropped it in Pennsylvania hoping for a return next spring in Michigan. I dropped it in a TB hotel, but 2 wks later, no action in that cache. Maybe not the best future for it.