Every self checkout around here has an employee staffing ~6 terminals. They're supposed to be watching for things like that. Usually theyre just staring vacantly into space, which I get, that job pays nothing and provides 0 mental stimulation.
When you see a TV being purchased, though, it wouldn't be hard to just watch that it in fact got checked in as such.
> Usually theyre just staring vacantly into space
That's far from my experience. Usually they're overworked with a backlog of customers having some kind of issue needing attention. It usually takes a few minutes to flag one down when I need them to take a coupon or check and ID, because they're already busy doing something for another customer.