You make fun, but I could see this being pretty useful. We don't all have large homes, and we don't all have cars or vans that make it easy to get things into & out of storage units. There are lots of people in large cities who have neither.
A service that could quickly & cheaply store and return things I want to keep but don't need all year round (like maybe winter clothing), could free up a lot of room in a small apartment. It's not the box that's novel, it's the storage & delivery service. I could see myself paying for this.