Being friendly and knowing someone's name is usually good enough
I would bet the same principle works here. The whole idea of the auction is to get rid of unwanted items and get paid for it, and that’s exactly what’s happening here as well.
If her company knew she was doing this I’m sure they’d oppose it and likely fire her.
It would only work if the person running the warehouse was an owner. But if they were an employee, like you suggested, then my take would be very obviously flawed.