They're only available on certain parts of the second floor floor (specifically, currentLocation.slice(-2) is a number >= 17), and the event also requires the Raiders to know Steele's identity (and there's also a four-day cooldown).
Assuming that the 'slice(-2)' function takes the last two characters of whatever it's applied to (in this case, Steele's current location), that means the scene is available on all tiles where the last two characters of that tile's ID are 17 or greater. That basically means the entire prefab (i.e. southern) section minus the two northern tiles of the robotics lab.