I have it bolted to the rear tow strap bolts and I also have a metal straps bolted at the back to the tub. The top has a lock in the middle and is covered by the cargo mat. With the gate closed you can't open it even with it unlocked but I wanted extra security.

 

what box is this? Please list a product and model number!!!

 

I have a living my profile of the trunk I built. It gives you an idea.

 

It's a custom box I had a guy build for me. I gave him the measurements that I was looking for, and he made it up. Send me a pm and I can send you some info if you'd like.