Kinda related, when I worked for Micro Center, there was a few cashiers that got caught trying to pull some scheme. When customers were returning relatively low dollar items, they were putting it on a gift card that they were passing between each other, instead of the customer's card. Then they would have a friend buy a bigger item with that gift card and sell the item on ebay. What they didn't realize was, LP had pinhole cameras mounted in the ceiling tiles above every cash station and started checking them after a few complaints from customers about returns. LP were also off duty cops paid by the store, who immediately arrested the cashiers when the came in for their shift.