I buy several little one dollar photo albums, the kind with clear pages, that you slip a photo in. I use these to store receipts for important purchases. It is really easy to find and store. This makes finding receipts from Wal-mart easy for me when we need to return something.
Also I unfold boxes and make them flat and store them in a plastic tub in the storage room. This way the boxes don't take up much space and if I need to return something, I just put them back together.
Why didn't I think of unfolding boxes. I have some thrown in my garage now taking up space. I didn't want to trash them in case I needed to return an item. Thanks for the tip.