UPDATE 2:

So the helmet was looked at pretty extensively by a few sources. Riddell confirmed that the helmet was the right color and had the correct paint. It also has the correct padding for Brady. They confirmed it was definitely a "Game Ready, Pro Style Helmet" but cannot confirm it being worn by Tom or not.

It was also confirmed by Shutt that the "date code" on the face mask is 1995. Do players generally wear "newly" manufactured masks? Would this be a sign it's not real or is it feasible that he might wear a mask made in 95? Not sure.

The green helmet sticker on the back indicated it being a genuine sticker from the NFL as it has the proper epoxy "glaze", different from replicas available on Ebay, etc.

A concern was the flag on the back missing the white border.

Another good sign was the small worn spot which is in the correct area for the microphone inside the helmet.

It seems to be a general consensus that the helmet itself is a real, game ready, player issued helmet but the question still remains, was it worn by Tom.

One suggestion is that it was a practice worn/used helmet. I have a friend with ties to a few retired Patriots who offered to show pictures to them to see if they can offer any feedback on potential authenticity. This source also is friends with Patriots offensive line coach Dante Scarnecchia, who the helmet is said to have come from (via his wife).

If anyone has any feedback on the above new info, I would appreciate it. Going to continue digging.