Seems to me the heat should be on those who try to sell "fake" antiques, rather than those who build reproductions.....unless they are trying to defraud.....unlikely if they have placed a signature on it somewhere and documented it in photographs and on the internet.
This seems like a Campbell Brown question, trying to make some issue where none may exist?
Its good show business..... about as ethical as trying to sell a new reproduction as a real antique "forgery"!!