It was leaked to a sports reporter that 11 of the 12 balls were at 10.5 psi, with the 12th also below the legal limit of 12.5 psi.
There’s a video on Wall Street Journal where a reporter inflated a ball to 12.5 PSI. Then he placed outside where the temp was 30 degrees. After 2 hours, the ball had lost 1.5 PSI.
The NFL has not stated that - until those facts are out there - we don’t know.