I have 2 large area rugs that the backing is separating from the rugs it’s been more than 2 years but Costco still sells them. Can I return to get a refund?

I don't see why not and should be able to get your money back.

You sound like a fool there's only a 90 day return your cheap and frankly that's an idiotic question

What was the guarantee time? It would seem logical that after two years the rug is yours. The wear and tear on a rug is so subjective. So many factors come in to play... location of rug, surface it sit on, any split age on carpet, how often is was cleaned/vacuumed, was there a pad underneath, dogs, etc. Things like that. Bottom line is was there a warrantee time? Let us know what happens.