I think it would be wise for them to stagger their lunch shifts so they're not all out of service at the same time.
Guaranteed they weren't the whole shift. Being all the motors were out together, they probably just got done with training.
Staggered lunches are mandatory, and many places don't like more than two at the same place.
Also, were the officers not facing each other, meaning someone had to have been facing out towards the general entrance area? THey were looking and hearing-believe it.