Facebook is eternally plagued with legit looking ads for stuff at 10 cents on the dollar, including ebikes. My wife answered one for Keen shoes, at 90% off. I heard her complaining about her credit card not going thru, and she was about to enter the info for a second one as requested. "Stop. Stop. Stop!", I yelled.

I did a whois on the seller website and found it had been opened that very day, linked to someone in Singapore. I pulled up our Visa account and saw that the charges did go thru and were pending, Finally, it was off to convince a skeptical person at Bank of America that we had been scammed, to cancel the card, and start a fraud case. We did get a new card issued but it took two billing periods before they erased the charges,

In this ebay case, I don't know how the scam will work, but it cannot be real, so there has to be some hinky stuff. Maybe you get an empty box just before the ebay or paypal deadline expires. They answer and exclaim how they will re-send the goods, but never do, and if you don't escalate the matter fast enough, the clock runs out on your refund.