I don't have a problem with the detents on mine. Mine (72x30) came with a second set of detents - I honestly can't remember now if they came installed with the "softer" or "harder" detents, but I know I liked the drawer detent action better after swapping them.
Either way - if you're moving your box, lock it before you move it, and you won't have a problem with the drawers opening up on you.