SNIP
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>Do Walmart randomly stop people to check receipts against what in the bag ?
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>I agree with you about the karma . If someone gives me too much change or makes an error I notice I will point it out to them.

Here they do. Those friendly folks at the door watch everyone going in and out and if you have anything large or of value they compare what's in your bags/cart to what's on the receipt before you walk out.