I know a member was able to do it with its 64 built 901. He travelled personally to Stuttgart. Dito for owners of important race cars.
But as I wrote, you need a reason why and most likely they will decline if its just an ordinary request.
I also know giving out a Kardex by the factory is illegal and thats why we cannot get access.
That single contact doing it via the registry is working in a grey area.

And now even the COA cannot give matching infos (chassis/engine) anymore to owners, while the amag archive also clears out one important info, to prevent futur forgery w chassisnumbers. I guess all factory policy.