There was a short video at SHOT. If I remember correctly, they showed the sorting of a batch of cases, separating cases in a tray after a short time in the AMP. I believe the unit showed a program for each case. Should be no sacrificed case other than initial case. That's my guess.
Actually, IIRC, the AMP showed how each case compared to the average of the cases you're sorting. There were vertical lines to the left/right of center indicating how far off it was from the average. You'd pick one of the cases to test that was right in the center of your batch.