LEGO Harry Potter Knight Bus 75957 Retired Product Incomplete? Purple Bus Wizard

This is a vintage retired Lego Product from the Harry Potter Collection The Knight Bus/Purple. I am unsure what pieces are missing if any? I found it assembled in my kids stuff and selling AS IS. No figures are included, what you see in the pics is what you get. The assembly directions are online at lego.com. A wild ride aboard the Knight Bus™. When kids catch the purple triple-decker bus, they know they're in for a hair-raising, magical adventure.