Vet rest is a normal policy for NFL teams throughout the season as far as the injury report goes, especiallu on Tuesday and Wednesday. Some teams have a set day off for vets and it looks like Buffalo rotates through. Most of the time, guys are banged up and they report whatever injury issue there is because you have to report in the NFL.
They don't need to practice as much as younger players do, so Friday and Saturday injury reports are a much better indicator of what will happen on Sunday.