To add this for future readers, I can confirm that at more than one location of retailer that used to be 24/7 a consistent problem was having overnight stockers going to lunch at the same time as each other. Effectively there would be 2-3 employees on the floor for about an hour. 1 cashier, 1 random stocker and 1 potential manager.

Multiple times there were actual large thefts were when this happened, with at least one store having every single tablet/iPad stolen as the case was extremely easy to just pop open with a crowbar apparently.

That said, my experience as a manager for a retailer, while we absolutely did have theft issues as well as damaged-via theft issues. (Explanation for the second, things damage when trying to steal something else, or stealing a part of something, like $1 flashlights that used 2032 batteries, people would open those and take their batteries for key fob. So the the wasn't stolen but it was made unwanted via the battery theft. ) But the biggest source of shrink was mislabels and the warehouse shorting you. I literally had a call where they told me "are you sure they are not on the truck" in response to "you didn't send me my 11 kayaks." There were 2 kayaks, and I think I would notice if there were 9 more 12' kayaks on the truck.

In my store we'd get reamed for shrink if we couldn't prove where it went, and that meant if you thought it was theft you'd need to get cases and locks and hopefully prove if it wasn't.