The bundle coming from the top left are the mostly Category 3 cables going up to the various residences above and businesses on street level. The bundle from the top right is the service drop from the pole (I'm surprised there even is a pole in this dense a neighborhood).
The blue Category 5 cables are actually bridging connections between grey boxes.
There's even some doorbell wire used as jumpers in here.
if I traced the cables going to the box labed Unit 6 (mine), I'm sure I could hook some of them up to...other..boxes and see what happens.
There's not much of a way to get caught once it's in place. It's just getting it in without being seen that's the hard part...