I didn't mark the TB as unknown location and the cache where it was last placed in still exists.
The last one who has discovered our TB has logged 87 other TB's on that same date, I can't find a found log from that geocacher between the logs of the cache our TB should be in, so this geocacher isn't very trustworthy in my opinion, because this geocacher is also the last discoverer of many other TB's.
The last log is a write note, but a writer of such log cannot change the "Recently spotted in" comment.
I'm not happy that our TB is lost, but it is part of the game and who knows the TB comes unexpected back in the game some day.
I'm just curious who can change it to Unknown Location.