I'm surprised my store doesn't have more theft in it than it does. They let the backroom team members carry their jackets and backpacks to the back. All it takes is for one of them to figure out where the blind spots are.
At the store I worked at almost 10 years ago, we got an employee who was bringing in a disc-man to listen to music on. One night it ran out of battery, so he grabbed a pack right off the shelf, pocketed half the contents, and put what he needed in his player. He did this right in front of me, and yet they kept him for almost a month.
Not the typical theft situation, but that same store also had a problem with people purposefully slicing open bags of candy while stocking, so they could have a snack. The STL had to announce at a huddle that if anyone was caught eating candy from a bulk bag of candy out on the floor, it would be grounds for write ups.