Hah. "Receipt"? That guarantee above the door says nothing about a receipt. We don't need no stinkin' receipt!
Years ago, I worked in the plumbing & hardware dept. at Sears for a while. A certain element would occasionally march in and demand refunds for Craftsman power tools that they had obviously just bought at garage sales. The persistent ones got their refunds. That was what really opened my eyes to the greatness of that motto above the doors. Since then, all of my major appliance purchases have been from Sears.
If they don't add something like "certain restrictions apply" to that guarantee emblazoned above the doors, the persistent ones will continue to get their refunds.