Not sure what you mean by re-finished. The stock has not been sanded.
There may have been some sort of oil applied that dried up on the metal part of the stock.
Why are you so sure the number was not corrected at the factory?
I am not being smart or trying to dispute the issue.
I just want to know for sure whether the bolt was re-stamped to match by someone other than the Germanicon army.
And if so I would like to know how one can tell.
The stock seems to be a non issue in this respect.

I was asked about the Waa stamps.
Here is what I have found.
77 is marked on the: Receiver (next to the 3 swastikas); bolt stop (top); Rear of the bolt; under the bolt handle; under the safety;
Waa623 is marked on the: Barrel (right side); stock; muzzle band;
Waa497 is marked on the butt plate.

There are NO import marks.

Hope this helps.