I upgraded to the K20D just about 2 years ago. Pentax was in the process of closing out the model and offered the extended warranty with it. I too ran into the same registration problem. About 6 months ago, I was having some high noise problems with the camera and sent it in for repair. All that was required was a photo copy of the warranty card along with a copy of the receipt. So, keep all of these items together, if they ever are needed. One benefit of the warranty is a free cleaning prior to its expiration (1 year base warranty + 2 years extended = 3 years).