There was a guy selling reproduction inserts and probably still is so it pays to be careful, this is news to me but to be honest its not completely surprising.
I would say that the one good thing about buying things that have a bit of damage (edge ware, tape damage, sticker tears etc) is that the probability of someone making it look old by damaging it is quite slim.
I think I would rather buy a tatty vintage piece than a reproduction (by mistake or by being scammed)