I see you have asked over at MWR which is probably the best place
Failing that Ross Povey is the fountain of all Tudor Knowledge he runs Tudor Collector . Com (he pops up from time to time here as well)
You could ask him I guess he is also on Instagram
As you know you need to do your home work before you buy, there are lots of fakes / Frankens about. It’s a lot of money to loose on a bad one if you don’t.
As mentioned on MWR, the ledgers are not complete and decom papers have been forged so I would look at it as a nice to have but not the conclusive proof that the watch was once in MN service.
It’s the range of serial numbers that proves if a watch is legit.
Best of luck