It is true that all 340 cars were a Formula S car. That should be all you need to go on. As far as I know there is no distinction on the title for a Formula S either. It's too bad that the fender tag is missing. Not that the fender tag would have mentioned Formula S specifically but it would have listed the options that were unique to the S. Anyone can look at the car and see that the options for an S are there and if they can't identify them they can go look at the Fords and Chevys.
