It's no longer in my cache GC51QBK "All fenced in".
There is a note on the cache's page by a new cacher (2 finds) about taking it from the cache on the 27th. I've sent a note (both by email and using the message centre) saying that taking the TB should be logged on the TB's page and saying how to do this is explained at http://www.geocaching.com/track/howto.aspx
I'll wait a few days. If the TB is logged, I'll delete this note. Otherwise I'll mark the TB missing from my cache.