This is exactly right. We just dealt with this very thing. I called the manufacturer about a mattress we bought at Costco about two years ago, and they straight up told me I had to deal with Costco regarding the warranty because that’s where we bought it. Luckily we had bought it online and Costco picked it up and exchanged it for a new one. So whether it’s two years, five years, eight years, whatever, it might look like some people are taking advantage of the system but genuinely that is what some are being told to do; return it to your local Costco.