Stick to brand new items from dea If by whatever slim margin of possibility exists you bought a dud buyback crown from a dealer and brought it to their attention, it would be replaced on the spot for the sake of their credibility. Try that on eBay or Gumtree
I am scared of ebay, I don't think I will ever purchase there. And honestly, I see no reason to do so. Precious metals sell close to spot on major dealers. There are no deals to be purchased there unless of course it's a fake and they can sell well bellow market value. One of the video I watched, the guy was saying that buying on ebay was great because of ebay bucks. But if you have those, you can purchase other things with them, doesn't have to be metal.