Do you have photos of the cable in question?
If you find the cable is not as represented my guess is Amazon would help you out.
The Audioquest cables are produced in China anyway. so grey market is the most likely, but plenty of cables are counterfeited.
The whole issue is buyer be wary.
I just do not buy cables from private sellers anymore at all.
If cables had just a reasonable markup over production costs, it would not be such a bad problem... LOL
Well I bought a fake pair of Sky a few years ago from a member with good feedback until I sent my purchased pair to AQ for their inspection. When compared to a "real" pair there was a very slight jacket coloration difference as well as a different feel as to the weight of the conductors. I too fell for a deal that was too good. A legit seller isn't going to give high quality cables away...