It's obvious the kid doesn't care about the loss.
It's obvious the boss doesn't want to babysit employees over petty things. (Your loss of a tool is petty to most everyone, except you.)
It's not your bosses responsibility to replace your tools. . . unless he told you to bring them in and loan them to the kid.
The fact is, you loaned them out and got burnt. No matter what, you're at fault. If they stayed locked in your box you'd still own them. It's not fair. It *****, but the truth hurts. Be mad at yourself and learn from it.
As for the kid. . . a simple way to get back at him is. . . 100% ignore him.
You and your coworkers knowledge is worth a lot more to him than your tools. Let everyone in the shop know what happened and when the kids stuck trying to do something (and nobody will tell him what he needs to do or loan him tools,) the boss will see how worthless he is and have no choice but to fire him.
In any case, don't bring yourself down to his level by acting like an *** about it and using violence will do nothing. A police record and / or lawsuit will cost a lot more than $100.
Just my .02
Edit. . Wasn't trying to sound like an uncaring *** myself. I can relate in a different way. Back in the mid 80's a friend of mine needed a couple tools so I popped the trunk and let him use what he needed. Later on when I came out and the trunk was closed so I figured it was all locked up tight. Uh. . . no. A few days later I popped the trunk to stop a couple tools that were rattling around and that when I found out he never closed the box. As such the drawers slid out, it turned over and most of my tools went through a little 4x1" rust hole in my quarter. In fact, almost every socket I had was gone along with anything small like feeler gauges, swivels, etc. I found a few tools in the other quarter panel, but mainly I just had big items left. These were mostly all older SK, Blackhawk and a few Armstrong (I think) items handed down (Ah-hem. . . borrowed and not returned) from my dad and grandfather, and a few from an "Allied" kit that I'd got from Sam's Club back in the day.
That was a hard lesson. To this day he still thinks my facial expression was on the of the funniest thing he's ever seen.