I started using grocery self-checkouts during COVID, but I’ve kept using them because there’s rarely a line (and I’m a misanthrope). I’d probably go back to using regular human checkouts if I had to dig through all my crap to prove what I bought.
Having said that, I’ve noticed myself making mistakes. I’ve accidentally failed to scan an item, and I’ve accidentally entered incorrect codes for produce. When I notice, I fix them, but I’ve probably missed a few.
I guess the easiest answer is for grocery chains to reinvest some of those windfall profits and hire more cashiers.
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It’s actually in the membership agreement. If you refuse to show, they can ban you. However, the fact you would have a Costco membership indicates that you signed an agreement that allows them to have you show the receipt.
In my experiences, it has always been something flagged by the receipt checker at Costco confirming that I got something I paid for and had to collect for the secure area, or provided to me at check out like movie tickets.
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It’s all good. The moment they demand my papers we go talk about it at the return counter anyway. They can double-secret-ban me if it’ll make them happy, but they can’t fire me as a customer if I’ve already quit.