My best guess is that the NYNFL is contacting all 31 other teams to see if the Pats did some sort of scouting documentary in their stadium...
That should take no more than a half a day to accomplish. The length of time this has taken is absurd.
So either...
The NFL knows there's nothing and they're just hoping people forget about it, or the NFL knows there's nothing but they're trying desperately to dig stuff up.