If you do buy anything from flea bay and it's fake you are 100% entitled to a refund as the seller has misrepresented the add and PayPal will side with you.
More than likely you'd also be able to keep the cable, the seller doesn't want a junk cable back and he'd be forced to offer a full refund.
It could be though you might have to ship it back to the seller, a legitimate seller could obviously make a mistake and list something that's not real.
Also a pos buyer could play some games and suggest he was scammed and switch out a real for a fake! Or you could just never buy or sell any expensive cables on flea bay.
I have some kimber listed and there legite and now I'm scared of being scammed. I'll investigate further before shipping