Receipt checking is a peeve of mine. I generally avoid it by walking by and not making eye contact. Occasionally I say, “No thank you.” At Costco, of course, I have to submit because it’s part of the membership agreement. But I often go with a friend (who would no doubt prefer I leave her name out of this), and we play games like showing one receipt when we each bought items (and we always get by). The whole thing is probably just supposed to be a deterrent. I find it a nuisance.
Anyway here is a good story from someone of like-mind in Virginia at Wal-Mart. And I find myself almost sympathetic with Wal-Mart in this case.