...so I reckon the OP has time to burn in this case, i.e. an individual knowingly selling counterfeit materials while claiming they are genuine.
Also, if you bought a fake Monet from a dealer who had a sterling reputation in the art world, do you really think it would be caveat emptor if you discovered it was a forgery a year later? I don't.
PS: All this seller has to do is make it right--how does the passage of a given amount of time absolve him from doing the honorable thing?
PPS: Do a search for "Jason Latif" to see what kind of safeguard pablum like "buy the dealer" really is.