Saved me a lot of typing above, but basically a race car has no VIN for road use registration, simply a factory designated number for race ID purposes, stamped into the metal on the chassis or via a tag riveted to the chassis. The carnet system which allowed race cars to enter certain countries without having to pay import duties would have produced official paperwork as such based on that number, and any sales documents from the factory to a new owner. Ferrari never sold 0846, they scrapped it, and probably kept any useful components on the shelf, and then probably sold them on at some stage to people like David Piper. I imagine like most factories then occasionally the scrap metal merchant comes along, offers a price and removes the pile, it is then his to do whatever he likes with it. As a result Ferrari have no ownership of the scrap metal after that point so have no claim as to the metal remains of 0846 wherever they ended up, so wont be chasing Jim anytime soon to recover it, if in fact any is in the frame of 003. You can label an item with whatever number you like, and others can also easily use that same number for their own system. When registering a car for road use it has to contain an identifier unique to that countries registration system, it appears Jim decided to call 003 "0846" in New York and as long as they don't have any other car from any other source using that number on their system then thats fine. He could have registered it as "Apollo 11" in New York even if it contained no elements at all of that space ship, and as long as no other vehicle also had that unique identifier on their system then its good to go. Would not mean that just because its called Apollo 11 on the New York DMV system that is has anything to do with the original, or that NASA would want a share of it. As can be seen above with the Denis Jenkinson take on things, the situation with the claims about Jims 003/0846 is not unique, its been going on since cars were invented.