Check the throat of your sewing machine. Thats where I have stored fabric I wanted to use for my next project. Or on your sewing chair. Do you have a cat? :)
Or, did you see a that green fabric at the fabric shop and decide against it because, you have plenty at home already? So, you go home wash all the fabric up, then 'think' that the green should have been there because you are still thinking that one in the fabric shop would be perfect? I have done this. I learned I had new nicknames that day, created by myself.
There was a gal on here whose husband moved the recliner and found her stash, still in the bags. Could it be under her chair?