1. I do not permit my children to bring their toys into a store if the store may carry similar merchandise.
2. If I don’t get a carry-out bag from the store, I hold the receipt in my hand when I walk out.
3. I try to be as careful as possible regarding complementary items; e.g., taking only the amount of ketchup packets I need for the food I just bought, offering to pay a quarter if I ask for an empty disposable cup, etc.
People are not concerned about such minor matters. They are refering to such practices are “Paying off the books” or not charging sales tax for example