I don't think a lot of them care. I recently won an auction for an original box of 36 caliber cartridges for "Colt or Whitney" revolvers. When I hadn't received an invoice 2 weeks after receiving the confirmation email on placing the winning bid, I was informed that they actually didn't have that item.
So they listed, described and sold an item they actually did not have. I left them a scathing review online but it was just one of many about this auction company.
There are some good auction companies out there auctioning legitimate items, but I've seen too many "authentic Confederate" items selling for a couple hundred dollars instead of the thousands a real item would cost.
caveat emptor