P.G.
Hang tough. He doesn't truly understand the consequences of his behavior, or the morality of stealing. He knows what he wants and when he wants it.
Stay firm and follow with consequences that increase with each incident. He is trying you, seeing if you will cave in. If this is attention seeking behavior, them make sure he gets positive attention when deserved as well as consequences for misbehavior.
All three of my kids went through this. When they found it didn't work out like they wanted it to, they gave it up.