When you buy a bed, you set it up, put the mattress cover on, then the bottom sheet, then the top sheet, then the blanket(s), then the spread, then the pillows, then the pillow shams, etc. A few days later one would usually get to the registration process. You have to take the made bed apart to find the tag with the serial number. The serial number should be on the paperwork which is handed to us. Why so difficult? The choices are different than the paperwork show. The Kelburn II is described as medium firmness, but that was not listed as a choice so I picked 'firm.' The word Performance is also not on the paperwork, but I selected it. o reason why the terms shouldn't match the paperwork??