I always see the guy standing there, wanting to check my receipt, and I'd let him if he feels it necessary. Normally I just give them a nod, and they one back to me, and we go our seperate ways. I see other people stop by him and show him their receipts (he doesnt check them off though, just looks at the receipt, then in the cart/bag) but I just casually walk by them with my newly acquired goods. I wouldnt hesitate to stop if he were to attempt to check my receipt, but he just doesnt... maybe he can tell Im just a stand up guy...?
Next time I will beg them to check my receipt.