So it doesn't matter is it vendorable or no because in both cases it is rather duped (or even surely duped)?
I just had a look on Manticore's list. It shows that there were
4 dropped on Baja.
I think its fair to say all the ones for sale these days are duped. I'm sure mine are also, the fact I can place on a vendor is just a bonus to be honest.
People who think just because an item can be placed on a vendor means its not duped are crazy imo. It has been discussed on this very forum many times that the "dupe checking" does not work for many (if not all) EM items, server births etc.
I have come across un-vendorable Slithers though, but these aren't EM items or server births.