So per the whole deflated balls mess, one thing I was unaware of but which provides a little more insight is that each team uses the balls that they provide when they are on offense. The balls were tested at halftime and found to be underinflated, and swapped for backup balls apparently. I don’t know if the backup balls were also found to be underinflated.

The balls for the Colts, which were exposed to the same conditions, were not found to be underinflated at the halftime test.