Chris:
I was contacted by a guy who saw a post of mine on another forum. He was helping the wife of a long time friend who had passed on deal with the rifles in his estate. One was a H&R Model 65 in the 63xx range. He recalls when his friend got the rifle when they were teenagers.
The rifle had with it the commercial sales papers that you may have seen elsewhere including the letter apologizing for the rough military finish. Unfortunately the paperwork doesn't list the serial number to make a concrete tie so it just becomes information and not proof.
Cass