I believe that you can leave him a note by going to the justice center in the room on the se corner of the building. I would write it there with the pencil and paper they provide and give it to the workers behind the counter. He has to put you on his visitor list to be able to see him.
I really do not know more than that. I do not know how he is, nor do i understand why he dropped out of site for so long. I would rather people go and see him, then use this thread to speculate though. I just wanted people to know he is alive because so many of us have been concerned.