I had them stacked in a box on top of each other. i was always careful, but the proof fields on two of my franklins got scratched when i hit the case with my elbow. it jostled them just enough to drag a couple staples across them. they are faint, but on a proof........
Sorry that happened to your coins. I will be sure to either avoid cardboard 2x2, or to inspect and flatten any staples. Thanks for the teaching moment.