This also happens sometimes in the racing world where there are more of some very high value racing cars than were ever produced in period .... don't think all the vintage Bentleys or lightweight e-types would welcome close scrutiny .... often they're 'famous' cars which have been crashed or worked on and the engine has gone one way and the chassis/body gone another .... both to resurface later as as 'the car' ..... somewhat different from the wholesale activities of car ringers in the ordinary world .... I don't think I'll be losing sleep because a picture of my ordinary car's chassis plate is on an internet forum, but each to their own.
K