When I purchased my ammo there was a sign that said 3 boxes per customer. It took a while but I finally realized it was not 3 boxes of 22 and three boxes of 9mm [make up your own list.] and that is what I bought.
I got 2 boxes of 22LR 100 rds. each and 1 box of bulk 223 Fed. 100 rds.
That is 3 boxes.
I did not argue or hassle, I left with my ammo, very HAPPY HAPPY.
Now, what do you think I did???, Leave the area knowing there was ammo on the shelf? No, I went over a couple of lanes in the store and found Panty 6+, AKA Old Lady, The Squaw.
She went and bought her 3 boxes, all 22LR and was happy as hell. She shoots 22 handguns so it was no surprise to me what she bought. However, if it would have been 2 boxes of 22 there and a box of 9mm. or nothing else, she would buy what she uses and nothing more.
We left and when we got home The Squaw got out some older ammo and replaced it with the new buy and she is still out at the range.
Just a thought, but do you have a "Here's Your Sign?" show sign? Regards, FM.