When I cut off selvages I cut just a tiny bit of the fabric on one side so I can identify it later. When I finish each quilt, I make a quilting journal of the fabrics I used in each quilt with either tiny photos or tiny scraps of each fabric. The only time I keep selvages attached are when they say "non commercial use only" because it's not worth the headache for me to put those in a customer's quilt. I try to check fabrics before I purchase them now so I don't end up with such nonsense, but I have a few of them in my stash that I only use for family quilts.