As with all vintage cigars storage is the most important factor, providence next. If I'm going to pay the $$ to try one I would only buy from someone I trust 110%. A few years ago a bunch of Davidoff's hit the open market and imho most were expired. I've had the pleasure of trying a few and the best came from a freind who opened a box (#2's) at a herf and I was able to pull the first cigar from the box, what a double treat that was.
Now if you can get a Dunhill Cabinetta you are in for a treat.