Not sure which post you are referring to, but if it is the post indicating the rifle was not a DCM Sales rifle, that only shows there is no record of it having been sold as a NM. It could have been a military NM which was never sold as a NM. The military retained NM rifles need to have everything original to a NM rifle of their particular vintage as a very good indication of what they were. As indicated by other posts, the rifle could have been a NM that never left the military, and at some point was turned in, rebuilt, and issued as a service rifle. It would be an individual decision as to how much premium one should pay for such a rifle.
The SRS letter indicating the rifle was originally sold as a NM is the best proof you can have of what the rifle really is. I have a NM with SRS documentation that it was a 1925 USCG team rifle which was returned to Springfield Armory on October 31, 1930, rebuilt into a 1903A1 NM, and sold to a civilian at the 1931 Camp Perry matches.