Simple answer. They are not original. They are reproductions or you could possibly describe them as continuations? To be kind, he seller is not using the word original accurately. Or he is being intentionally deceptive to be the most cynical.
The most obvious advice is don't buy them for that price. If you feel offended by the auction, send the seller a message explaining there is no such thing as an original 65 GT350 that was built in 1990.