Have you guy priced the cost of a new Snap-on KRL drawers? You could pay a couple of grand just on replacement drawers here. Then add the cost of the side handle.
THEN you get into the bodywork. Most of the bent areas are folded over metal where youy can't get to the back. So there's a good amount of bodywork here, assuming you could even get it right. And when you paint the repaired side, even assuming you get the exact PPG Snap-on Red paint code, it will not match all that well. Bottom line, it's hard to match a powder coat finish with a paint finish. I have had body work done on a red Snap-on locker using the exact paint code, and while it looked pretty good, (and much improved from the damage I had), the finish never looked quite the same. It's just a different kind of finish.
So the price may look like a bargain, buy this box will never be 100% no matter how much effort you put in. As far as the tools, you'd have to see what's there. If it's jammed with Snap-on tools, $6,500 for them could be a home run. If it's sparsely filled, or filled with Craftsman, not so great.