I had a complaint about them placing a sticker on the back cover. They responded very quickly and stated that this is something they are in the process of changing. They also offered a partial refund or full refund upon return. I suggest that if a sticker that is not removable bothers you that you contact the company and ask if they are still doing this.
Please accept our apologies for any inconvenience caused. Our customer support team will investigate the matter and get back to you with the resolution. - BooksRun Team