If he is getting out of Detox, that is different than rehab and the only reason I point this out is that he may be clean but may not have the tools to stay clean. I pray that he does, but please protect your money and possessions until he has some quality clean time under his belt.
Of course it is good to enjoy any good days, and there is nothing wrong with thinking positive, but that doesn't mean to let down your guard and make yourself vulnerable again.
Just be careful, this is a testy time for anyone early in recovery.
Hugs