And since we are onto picayune second-guessing, I would like to add that I am suspicious of the league here. Was there a proper chain of evidence that was preserved for the balls as they went to the place to get tested? Was the testing facility vetted by both teams? Were the balls kept in a constant temperature, humidity and barometric pressure environment prior to testing? if not, I question the validity of the tests.
For instance, if the balls were put on a plane to get to the testing environment, they were likely put in the luggage compartment, which is NOT pressurized. The air in the balls would then have swelled and stretched the leather of the ball. Once returning to sea-level, the now-overstretched leather would have less resistance to the internal air pressure and voila: less internal air pressure.
Even if the balls were in the passenger compartment, it is pressurized to 8000 feet, quite a difference from sea-level and the same effect would happen.
This is a cluster fuck.