While interviewing the owner of a grocery store, he told me about a warning he gives to his employees. If you see a person with a large item in the bottom of a cart and 3 or4 small items valued at about $10.00 there is a very good chance that they are a mystery shopper. This statement came to roost. I was shopping a major store and as I checked out the cashier said to the bagger to please remove thr case of soda from the shoppers cart. I have been called a customer and other things but never a shopper. ??????