My guess....lots and lots. We turned in a couple at a Sam's Club. They had 3 whole briskets, like 6 racks of ribs, 4 or 5 pork butts, etc. in a single cart. They were ahead of us in the whole self-checkout thing and they were looking around kind of weird. I thought they were looking for their kid. But then I watched the guy scan only some of the items in the cart while his wife distracted the lone employee that was nearby. He then buried the stuff he didn't scan and then hurried to get out of there. I went ahead after I saw this and told a manager near the exit to check their receipt closely. We got there close to the same time as my wife had checked out while I was talking to the manager and we heard the guy saying "oh I must have missed that one" as the manager scanned the barcodes and checked the quantities, yeah missed 2 of your $75 briskets and half the other meat, on accident. Sure.
But yes we all pay for it in the long run.
The manager thanked us as we went by, completely oblivious to the crab legs we had buried under the toilet paper. Heh heh heh.
Sucker.