Not wanting to get involved, but ...
I think we should all be aware that Italians may view originality different to the English/Americans. This is demonstrated when Ferrari Classiche restore or work on a car. Their view, to my understanding, is they built the car in the first place so can do anything they like and it will be original when they finish, i.e. make a brand new engine. "We" would consider that engine to be a non-original replacement ...
Pete, you are absolutely right! Except when racing, and an engine was blown, Ferrari conveniently procured a 'virgin' and restamped the 'original numbers' , in the 50's and now. Why? Because they could, can and will. Then, it is certified 'original'. No problemo.
I find this a truly practical solution.
At my local AR dealership, in the 70's, they would be blowing engines while racing,
left and right.
Bare blocks were re-stamped with the original numbers, with 'original dies'. Very practical also.
These, are all countries, where Customs bureaucracy was horrid, and taxation worse.
My father in law was the Jaguar dealer where I live, and he brought a D type. One day it was crashed and sent back to the Factory, then the Factory burned down along with
my father in law's D.
Guess what? Jaguar sent back a brand new D type with the same chassis number and engine number. and all was well. Is this an original car, or a fake?
The current USA owner, I am unaware if he knows...
This practice has been going on forever.