Now I have a question, why does Sam's always want to check your receipt? After all, the checker makes sure you paid for everything. And the way the receipt checker checks the receipt, they are not really checking anything, just marking it.
What they are checking is the number of items. Since Sam’s doesn’t bag items, it’s easy for someone to have an item in their cart and not pay for it. We had an extra cheese in ours that the checker failed to ring up and it was caught at the door.