Now I'm curious as to how you knew the box would fit in. I know I had an issue with my trunk, because even though I could fit the dimensions of a certain box in my trunk, I knew it might not fit through the opening. Sometimes because you have to angle it in, it hits the floor and you can't push it in, or sometimes the curves on the side of the trunk keep it from being able to go down enough for it to fit through the opening.
How did you get it exactly right?