I think the problem with TBs is that you very rarely know that there should be one there. It’s probably only when you return home to log the find that you notice it. And then you think maybe I missed it. If I know a TB should be there I look to see when it was dropped. If it is months ago I normally write in my log that the CO should mark it as missing. However, not many do this as I very rarely receive a log telling me that there is a missing TB in my caches. The only exception is my TB Hotel and then I get complaints that they are missing.