UPDATE:
Have some sad news. I talked to someone who knew more about the attic, and he basically said that the pink insulator stuff would of killed him by now and will eventually really hurt me, if I keep looking for him. I'm going to go in one last time to retrieve the dead pinkies, and then just hope I'll stumble upon him. From then on, I'll have to just hope he finds his way outside of the wall.

Thanks for all the help.