It's quite rare, I think. Thank you for looking. I purchased this item on this site and used it for about 1 hour a week for a week. I didn't type for long each day, and there are no noticeable scratches or stains, but please check the photos for anything you're concerned about. It's very convenient with the trackball. It's a wired USB connection type, so you don't have to worry about the battery running out, and you can use it right away. The box and instruction manual are also included. Thank you.