Leupold should have a utility on their website where you enter the SN and it tells you if it's legit and CDS used etc.
Seems to me that if you sell something that turns out to be fake/counterfeit that you have an obligation to take the item back regardless of what each party said or didn't say. Same thing with selling coins.
Thing is that you never know if the seller knew that he was selling fakes.
Like the gent selling for the vet. They aren't yours so you're not out anything, but he might be. You can take a BFH to them and put them out of their misery OR list them as counterfeits at a cheaper price. Make sure that buyer knows what they are buying [maybe sign a paper saying so] since it seems like they will work for someone. I will give the seller Brad the benefit of the doubt that he didn't know the scopes were fake until the buyer brought them back.
