I do know there are more V12 Auburn boat tail Roadsters than the factory produced. That is not the only cloned car as other high end cars have been rebuilt from the parts of wrecked originals( as stated on the forum before) ending up with 2 of the same car.
Ohio did not require insurance until the late 80's by law, if I remember correctly. MY point, per the show once the car left the dealership there is no known trail of the car. It could have been wrecked or stolen and IF the car was not insured it was the owners loss. Yes back then even into the 70's you could buy a car on credit without insurance. They could also know the Number of the Missing Shelby from the area and playing that up.