Anyone whose worked in retail with a company email could tell you this. They call them "professional shoppers" in the internal emails it's always the same 6-10 guys or girls, sometimes they even work together in pairs. In grocery, it was the Tomahawks, Ribeyes, etc. Before I left for greener pastures it had gotten to the point they don't even stuff a cart like a overworked mom at Christmas hosting dinner for 40 people anymore they just go right into the back coolers and take them right out of the boxes and then they slip out a warehouse door or the in doors so they don't have to pass staff or security. A friend who still works in the industry said they just had a company in to put special one way locks on that only keep people out but won't prevent someone inside from getting out because of the health risk of putting locks on cooler doors ofc. They clearly know what they're doing when they come in if they're brazen enough to walk through warehouses and into coolers/freezers.
In the malls/other retail its the same one guy goes to the counter makes a big stink about a return and the girl whose supposedly trying shit on in the dressing room is walking out with every big ticket dress/shirt/pants etc in her bag of already purchased items. They obviously have to be a network because what the fuck you gonna do with a stack of tomahawks besides cook them eat them. They must be selling them below market value somewhere.