I know they keep it locked up in the sporting goods section, but if they keep stock in the back, is that locked up as well? That's where my mind was going in regards to the ammo is them taking a box here or there from the back of it isn't locked up
Yes, the valuable/restricted items are kept locked in steel cages in the back of the store and as Walmart employees, they would know that. The back area is not as large as people think and most of the inventory comes in daily on trucks. Less used items come in as the computer shows supplies are running low. There would be little, if any ammo in the back and it would be difficult for someone not employed by the store to get into that area and if they did, they would likely need to enter the back side of the building via a door that is supposed to be kept locked. Policy got reinforced on that one after the store I worked at, was closed for several hours because of a bomb threat.
To access the back area, they would need a vest as well as the standard issue nametag, which carry's a barcode, used for time clocks and to enter cetain areas, as well as access the keys lockbox.
If they happened to make it to the back and it happened that they were unloading trucks and ammo was among the things being unloaded, it still wouldn't be easy to access because items like that come on a pallet with similar miscellaneous items, all very tightly wrapped. Employees are present when trucks are unloaded and each is tasked with a very specific job. Someone is there to take clothing and ready it for the floor, someone is putting security alarms on electronics and someone else is moving items for the locked cage, others start assembling things like bikes and others are grabbing boxes to be crushed.
The whole process looks is done with a supervisor present, there are more cameras in the back than there is in the front and even one extra body will cause a huge uproar. Theft in the back is a greater concern for Walmart than shrinkage in the front because items haven't been added to inventory so smart employees learn quickly that it's unwise to put their hands in their pockets for any reason and caught in the back without Walmart ID is grounds for dismissal and you will have enough time to pick up your possessions from your locker and you will be escorted out of the store.
Having worked there, I would assume both would know that and I would suggest they were hoping to find the ammo and airsoft ammo in the same display case. I'd hate to say it's not done anymore but it's not supposed to be because the belief is that someone could steal ammo, while asking for the display case to be opened for airsoft pellets.