Once cleared as good enough, the balls are kept by the officials until just prior to the game start, when they turn them over to the ball boy. Then, every play, the officials set the ball, and cycle through the supply as needed depending on a variety of factors including just how long it would take to chase down and spot the previous ball, or if the ball becomes overly wet/waterlogged (any change in volume changes pressure), and whether there are still more balls available. Occasionally, they run out of balls.
Just so you know the above statement is utterly false. The do get to change the balls for their possession for two reasons, scruff them up (so not slick) and to inflate / deflate within limits.
Aaron Rogers stated that he likes to an over-inflated ball and his team over inflates to the limit.
In Super Bowl XXVII, Bucs Quarterback Johnson admitted he paid NFL equipment officials $7,500 to deflate the game’s balls to his liking.
It is all to easy to cheat and NE did.
Wow. You mangled pretty much every part of that.
Even the 2002 Bucks part.