I think they’re just making sure you actually went through the checkout and you aren’t just walking out with a bag of stuff. I’m okay with that.
If they look at the receipt to make sure you scanned everything that’s just dumb. Unless they plan to check off every item in your bag.
Where I shop, they check for the big stuff that’s not in bags. They don’t go through the bags. The self-check stations have a system that tries to make sure you can everything that goes in a bag. I’ve had the minder come over to make sure I have three lemonade mix containers on the screen, three in a bag, because the system did an alert.
Actually I think they are doing a sort of mental parity check. If the tape indicates twenty items they quickly count the number of items and then assume that the correct price was paid for each one.
At Costco it seems like they always put their eyes on every item before checking the tape and verifying. I also think the good ones also look for an honest face.
I think they’re just making sure you actually went through the checkout and you aren’t just walking out with a bag of stuff. I’m okay with that.
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And they put a mark on the receipt so you can’t use it later for the bag of stuff you did not pay for.