Your ad is misleading at best.
Is there a motherboard and other internals included, or just a bare chassis as in the photo?
"Yes, only the complete desktop" doesn't clear much up when the pics only show a bare case. Most people don't consider the gutted husk/chassis of a computer "the complete desktop".
Don't mean to harass you on this, but I'm honestly interested in putting in a bid if it indeed is a complete machine rather than just a tin box.