On my way to work this week, I spotted these two classic Pirate sets in their original boxes in the window of a Vincent's charity shop:
I stopped for a closer look on my way home. The sets are used and seem to be in reasonable condition, although the clear plastic layer from the box of 6276 appeared to be gone. The raised baseplate from that set looked ok. I'm not sure if all the parts are there. Regarding price, the maximum eBay values were noted, but I think this is just to give people a better idea of the value of the sets as collectors items and not the actual asking price. I did notice smaller price labels of about EUR150 for 6276 and EUR260 for 6285 which is about the minimum Bricklink prices for used versions of the sets at the moment.
I've no interest in the sets myself as I already have my own ones, but if anyone is interested, I can PM the shop details.