68 Barracuda Formula S 340 missing trim tag and Vin / dash

Did you transfer the car ownership to your name yet?

Not sure exactly how it works in your State but, here in Canada, it's illegal to remove the vin from the vehicle.

Plus, if I have the original dash with the original vin attached with the unmolested security rivets and I have the current registration, I own the car. The body numbers are essentially irrelevant.

A title search may be needed to verify the legal owner of the car you purchased.

There's very very few reasons why some one removes the original vin and fender tag.