I got the leather one 6 months ago, and it was a box that was square, but only half the height of a stove or dishwasher box.
Well packed, and super easy to just slide on the back (it comes in two pieces, the bottom and the back).
I admit the box is heavy (for me it was), but the assembly is less than 10 minutes.
PS: I LOVE my chair. Guaranteed to put me into snooze land when I sit down LOL.