I bought several hundred rounds of 9mm 100rd wwb ammo at wally world. My usual ritual is to unload these boxes and fill up the 50rd empty boxes I already have. One of the boxes only had 99rds in it, I paid for 100! I guess the scales make mistakes sometimes, or just lazy boxers. No big deal to me, but if it happens 100 times.......they owe me a box!