I did the same thing - the case was less than $20 and it's nice to have it all in one place, including ipad and other items. It also fits well under the passenger seat of the car, so I always have it without thinking about it.
But, I do like using the original box like that - kudos to the guy who thought of it.
Now, if the DJI refresh could happen just by opening the box, and a new mavic appearing, I'm all over this idea.