Originally Posted by Ty
A thief with a screwdriver could make off with the box and everything inside of it in under 5 minutes.
If they want it bad enough, they'll get it even if you bolt it down, it just depends on how much damage you want them to do in the process.
In the past, I've actually used industrial strength velcro to keep my boxes on. You just stick the claw of your hammer in between the bed cap and the tool box to pry each side up and it comes right out. When it's down, it sits flush so it's tough to tell that's how it's attached, and without tools, it's pretty difficult to pry up anyway.
This method is pretty clever, causes no damage, it's pretty discrete in terms of security, and shows some good ingenuity. Nicely done.