Just wanted to say how much I admire your strength to get the Police involved as it related to the stealing. Family is a primary target for theft because we are far less likely to call the Police because we get this notion that we don't want to ruin their lives. Somehow we lose sight of how their choices are the only thing ruining their own lives.
There is nothing you can do that will keep him clean or cause him to relapse. You are not that powerful. None of us are. Detach from his recovery. No money. No gifts. No cute cards/notes. Give him the gift of dignity to own it.
It's his only shot at recovery.