I reality the Police or DMV are not going to be an issue, unless you try to sell a valuable car to a collector and the buyer makes an issue of it. If that happens money for lawyers come into play.
There is a thread on Pelican involving potential fraud.
http://forums.pelicanparts.com/porsche-911-technical-forum/365081-73-rs-fraud-must-read.html
Ask Jerry Seinfeld what can happen.
https://www.reuters.com/legal/litigation/jerry-seinfeld-settles-lawsuit-over-alleged-fake-1958-porsche-2022-06-02/
https://www.thedrive.com/news/jerry-seinfelds-fake-porsche