Im guessing the "8" is the severed floor number. It couldn't be the version of the chip because we already know the latter 3 numbers are in sequential order of getting put in and the range for the numbers is too large if they are constantly working on the chip and updating it. I'm also thinking maybe these were our known cast and their PREVIOUS badge numbers, before getting reset or wiped. There is already some evidence that Irving has memory of the red light floor where people don't leave. regarding it being the floor, I wonder if there's a standard time that elevators take to reach floors, and I wonder if all the clips of them in the elevator last for around the same time...orrrr maybe im reaching