I am not insulting anyones intelligence.
So, each time you go to the grocery store and buy 100 items, you go over it with a fine tooth comb in your car before leaving, and if they missed a can of soup, your going to go back in and pay for it?
I am simply saying....he obviously missed the cashiers error, or he wouldn't have bothered posting it on here.
I highly doubt he knew it was missed, then thought, "Hey this would be a great topic for OFC."
Everyone needs a break sometimes....