theres a lot of way...if you dont mind it being ghetto, you can get real creative. ive used bungee cords before, and had no problems.

the way a box is designed also can determine if itll move a lot. something with a bigger base than a top will be less likely to move than something that is equal, both top and bottom.

also, a carpeted box will move less than a non-carpeted one, due to friction.

you can always bolt it to the car, but i dont like, too much of a hassle.

if you are building the box, give it a good base to stand on.