Trust me. Walmart has been installing systems where the receipt will be tied to video of your check out.
I know someone involved in the sale of such systems. I described to a local guy years ago. He works (still does) for a very large, well-known convenience/gas station organization.
He later told me he went to training on this - they’re getting the same system.
I have never been in the ultra top secret video room they have but from the people I knew that had it was awesome. They could not talk about it though. Those pictures walmart releases of bad folks? Low res right? Wrong! Walmart has very hi-res they just don't want too many people knowing. LEOs know.
One thing about walmart is they are very forgiving. If they fire you they will hire you back, depending on the severity. I think they figure it cost more to re-hire and train a new person than it does to re-hire a thief. They probably have an algorithm they run on this. Usually after 90 days to a year they will re-hire you but maybe not the same store though.
The self checkout at the local grocery store has a small video screen so you can make sure your hair is smoothed down for the checkout video. I always give them a full face smile before I leave.
Of course, I know that's just to distract me from the cameras focused on the cart, the scanner, and the bagging area. I do appreciate that they've added the scanner guns so I don't have to lift the heavy items out of the buggy and try to position them on the scanner.
Nothing new here - its called a time stamp.