Hi Jason, good to hear from you (Plymouth this summer). I keep a pretty much up to date GSAK db for the whole country, and it has archived caches for about the last year but not before. I just ran a query on that and came up with 1483 archived caches with TBs in them. I think this won't be as reliable as a proper query would be, because it takes a month to update my entire db, and archiving has to be on the basis of not being refreshed for a complete cycle. There is scope for TB activity to take place which my capture never sees.
Nevertheless, I can send you a list of GC codes if you wish.
Won't be responding until tomorrow evening - very early start in the morning, going to the quarries and caves at Bath, for about the 10th time :-)))
Rgds, Andy