No way to know without PHS.
Unless it was a matching # engine car with known history.
All R/A had 3.90 Posi , but those can come and go for any reason.
And 3.90 was an option with other engines too.
If he really thinks it might be genuine, and 1 of 12, should be worthwhile for him to send some money to PHS. Especially if its built May or later. Jim Mino had good luck buying Bronze cars.
