In the end, whatever storage you choose, I believe that by principle, the storage itself should never be visible from outside the car, which pretty much leaves the undersides of the seats. As a rule, if the burglar sees a box, and the box is locked, he immediately knows that something valuable must be inside, thus creating an incentive for a break-in.
There is in fact some value in security through obscurity. There are very few boxes that you're going to be able to build-- or are even willing to build that won't stop a determined thief with enough time on his hands. So first, hide the box, then make it as hard as possible to get into without making noise.
There is in fact some value in security through obscurity. There are very few boxes that you're going to be able to build-- or are even willing to build that won't stop a determined thief with enough time on his hands. So first, hide the box, then make it as hard as possible to get into without making noise.