Well, I've finally proven it to myself. Costco's no-questions-asked return policy is true and works. I brought a pair of jeans that I had bought from Costco at least 6 months ago back this past Sunday. I didn't even have the receipt. After saying that I bought it a while ago, I was about to explain why I was returning it, but she didn't seem to need to know. She looked at the tag at the back of the jeans (for a product number or something), punched it into the computer, and gave me my cash back. That simple.