That's easy enough of the B&M you frequent doesn't do much business. My local B&M is Just For Him and they sell A LOT of tins, so you won't be finding a lot of aged tins there.
I know what you mean PB. There are only a few select blends that seem to actually move in the JR retail stores. I purchased a large tin of Four Seasons at the Burlington store today and I know that the two tins they had there have been in there for possibly years. That blend has not been produced for quite some time.