Your difficult child sounds alot like mine minus the raging. As you know Ryan needs a complete neuro-psychiatric evaluation. Continue to work toward that end.
As far as the stealing goes, can you get a large metal cabinet that you can lock up to put the valuable things in?
My difficult child's psychiatrist also recommended a nanny cam to monitor him at all times. I also had a security system installed to keep him in the house as he would run if I so much as went to the bathroom. You can get wireless ones now so that you do not have to make any alterations on the house.
I will not go into all the many dangerous and destructive things my difficult child did but I will say that the only reason he is alive today is because he was constantly supervised. For respise, I hired older kids to supervise him at family functions and sent him to day camp for disabled kids in the summer. I had to pick my battles carefully otherwise my difficult child would have been punished all the time. I even had to lock up his own toys and only let him have them when he was supervised because he destroyed everything. He didn't want to he just did things so impulsively. -RM
