I browsed the shop also and as a potential customer I am always wary of purchasing used CD/DVD based media without first checking for scratches.
I would like to recommend in the product photos to maybe snap a quick picture of the underside of the discs, maybe hard to get the lighting right but may be worthwhile since you are just setting up. As a personal rule I do not purchase discs without knowing first and I am sure I am not alone in that regards, maybe in the minority but probably not alone... I hope, maybe I need help
**Edit**
Just saw the "guarantee the item you receive will be in working order" statement on your about page and that does help. But a photo would remove doubts.