@jimboman would you mind sharing the photos from the original ad, if you can locate the former sold/expired ad, or search from Hifishark.
A few thoughts, even on some of the older versions, the jacket label lettering should still look pretty decent and not rubbing off on Golden Reference. It can be possible to spot counterfeits too, visually, with some back and forth photo comparisons - if the photos are decent. I looked over a few old ads, not sure which ad they are from. The seller should have no issue with you sharing the former public ad if they are legit.
Note; There was this one seller on Canuck last year who was selling cables with zip bags, not the original container boxes from Cardas, and sorta what appeared to look almost like color copied factory paperwork. I inquired a few times on these particular cables, and mentioned I’d be shipping them to Cardas for authentication, immediately, and never received a reply. I saw them reposted a few times, same photos. So I inquired again, several months later and got no reply. Will try to help figure out ifs the same person or not. They should have serial number paperwork with them, all of my former Clear Reference, Clear Cygnus, Parsec, Clear Reflection and others all had this. Most people dont easily lose the real papers and containers when it comes to Cardas. You do see this with dealer trade-ins some.
NEXT:
If you don’t return them for a refund, its almost a must to send them to Cardas for verification in case you decide to resale them later. And, at least you’ll know and have the proper papers with the cables for someone to take them off your hands. All of my former three pairs of Golden Cross cables were sent to Cardas and i had them reterminated with the new style solderless connectors, with papers, before I resold them. New happy owners now too, fyi fwiw.