But that may not be the end of the story.
They have not filed the paperwork to do so, but it is expected to happen. A team spokesman did not return a call for comment.
Davis told The Undefeated's Domonique Foxworth that "leaving was therapeutic" and "when it popped, I just wanted to leave it all behind."
Buffalo may leave with most of the money Davis was set to earn.
The veteran Davis was set to earn a $2.25 million salary, along with a $1.5 million signing bonus and $1 million total in per-game roster bonuses. He also had a $250,000 workout bonus.
He was placed on the reserve/left squad list Friday night and the rest of his base salary guarantee voids. He earned $264,705 of it.
As for the signing bonus, the Bills may argue that because Davis left mid-game, he's only entitled to 1/17th instead of 2/17 of it. He could earn just $88,235, though that precise amount is up for debate because there isn't a lot of precedent for a player exiting during a game and never returning.
As for his roster bonuses, he had $250,000 total in per-game bonuses for being on the 53-man roster and then $750,000 for being on the 46-man roster. He earned $29,412 of the 53-man bonus and $44,118 of the 46-man bonuses.
In all, Davis' abrupt retirement may mean he walks away with less than $700,000 for a 2018 salary that could've been worth $5 million. He did, however, earn more than $35 million during a Pro Bowl career.