Yes the Registrar would know.
We havent said it lately, but extraordinary claims require extraordinary proof.
If he wants to prove it, I suggest starting with a Marti report. I would love to know more details.
Surprisingly, It’s really not hard to prove. There are engineering inventories with lists of serial numbers. So, you cant really just say you have one, without paperwork. The engineers that built the special cars had to track them.
I’m quite certain he will not have that documentation.