A very nice rig indeed! It's interesting that the "AE" stamps on the holsters don't seem to have any rhyme nor reason to location. Of my two holsters, one is stamped inside and the other on the back. Your holster is stamped in a different place than either of mine.
From just what I can see in your pictures, IMO your M2 has not been refinished but has an excellent original finish. I could be wrong but I don't see any evidence of rounded corners or buffed-out stamps. In my observations, the two digits stamped on the back of the rear toggle is almost always more shallow and not as sharp as other stamps on a Luger. I tend to think that the numbers were stamped on that part before final buffing and bluing. Again, that's just my opinion.
From just what I can see in your pictures, IMO your M2 has not been refinished but has an excellent original finish. I could be wrong but I don't see any evidence of rounded corners or buffed-out stamps. In my observations, the two digits stamped on the back of the rear toggle is almost always more shallow and not as sharp as other stamps on a Luger. I tend to think that the numbers were stamped on that part before final buffing and bluing. Again, that's just my opinion.