It fits!
Just because something can fit somewhere doesn’t mean it’s a good idea to put it there. Unfortunately, the delivery person didn’t get that memo.
The box was exactly the right size for the recipient – well, at least small enough to fit through the square hole with a lot of wiggling. The only problem is that once it’s wedged in there, short of breaking open the box, there’s no getting it out again. Maybe a spatula? What a predicament!