Yup, and make him work the rest of the debt off. I'm sure you'll be very imaginative

Absolutely this. He intentionally spent $1400 and disabled a child lock as revenge toward you and DH. I would be selling his gaming consoles, his phone, any other expensive toys/items, etc. until that debt is paid off. I would strip his room down to the bare minimum - bed, blankets, toiletries, and clothes. I would make him earn back the rest of his stuff one by one with chores, yardwork, volunteer work, etc. Your SS sounds like a narcissist - does he have mental health issues? Is he in therapy? 

What does your DH think of all this? Where is the BM in all this? Is SS with you full time. 

No bed frame and no wardrobe. He can live out of a bag or box. 
 

i used to work in insurance and if a minor kid took parents car for a joy ride while away and never had permission to, we recovered off them. Of course parents never went ahead because most parents wouldn't consider suiting their kid. 
shame such a thing doesn't exist with unauthorised credit card purchases aka theft

Yep. A smartphone and a console will sell for a few hundred bucks. Credit him federal minimum wage for chores until he "pays back" the full $1400. It will only take him about 200 hours in labor.

I'd also take his books and other items that he uses for fun until he gets chores done for the day. If he wants to be stubborn and not do anything, he can sit in his room with absolutely nothing but his clothes and furniture. I'd even consider fixing him only peanut butter and jelly sandwiches (or equivalent) on days he refuses to do his chores. Keep him well fed, but it can be with something boring.

ETA: I agree with others saying try to get the money back from your credit card company BUT ALSO sell his stuff and make him work off the debt. If he had stolen from anyone else, the justice system would likely make him pay back what he stole PLUS do community service of some sort, so it's not a bad plan to make him do this.

Good idea on getting an assessment.  I cannot imagine how frustrating it must be to "punish" someone who has no conscience.

Not that this is the same, because it isn't- but I have found with SS21, who is Autistic, that it has to "hurt" him. He doesn't have empathy, he just can't mentally put himself in someone else's shoes. It has to be personally important to him. 

For example, he wouldn't brush his teeth. This was a never ending fight. So I stopped fighting and made him pay a dental bill that was over $600. He only makes $10/hr, so you can imagine that he figured out how much he had to work to pay that bill. He now brushes and flosses and used listerine like a crazy person. He even buys his own so it is the brands he likes. No longer a fight. (Now if I can figure out how to make him shower LOL!)

For those that don't feel empathy, in order to make in impact, it has to affect them either negatively or positively. Your DH is going to have to make this HURT for him. I am also a big fan of logical consequences. He stole, therefore his valuables are being sold to replace it. If he wants to earn back those belongings he is going to have to work for that too. This is a really excellent life lesson for him if your husband chooses to teach it. 

That's a bridge too far stealing the other kids lunches.

He may not have the items or $ that add up to $1400 but you sure can make chores (charged at hourly minimum wage rates) add up. If this is out of the question, i.e. your DH does not support working off the funds, then you've got a bigger problem. Stealing shoudl have ramifications more than just paying it back - interest and your time spent on this should be calculated into the amount owed.

If I had it my way... chore b!ches would have happened often in our house.. I didn't get my way though. *eye roll* I sooo wanted SS18 to scrub stuff with a tooth brush so many times LOL! 

I would be in jail. Swear to DOG if some asshat kid purposefully ruined something else while being punished I would beat their butt with a wooden spoon!