scottshotz said:I just drilled a 1/4 inch hole through the top lip of the box, sideways, coming out the side and loop a padlock through....works perfectly and free. You can totally remove the flip-lock mechanism afterwards as it serves no purpose now. Still carry the box by the top handle. Mine is a typical box, like bcsteve's.
The only problem with that is now your waterproof ammo can is no longer waterproof, if that's important to you.