Well, maybe for security.
I worked there ......... waaaaaaaaaaay back.
Of course we only had a few security up front. While there were maybe 750 of us in the back.
I know the floor doing 1040A people had 500 on the floor on any given shift (yes there were 3 during the week).
I got moved to a special area that processed payments soon after starting so I wasn’t out on the main floor too long.