Now may be the time to start setting additional boundaries, ie
He must decide on and then become involved in some type of recovery program, be it NA, SMART, etc. If NA he must also get a sponsor, etc.
You cannot be his jailer which you are being now.
He has to learn RESPONSIBILITY in recovery and a RECOVERY PROGRAM and a sponsor or mentor is the only way he will learn this IMHO.
Locking everything up, etc was a great way to give him a start, however, at some point you are still going to have to Let Go and Let God do the rest.
Sending prayers for you and your family.
Love and hugs,