The book was located on our shelves this morning and removed from your account. It was missed in the check in process. Thanks for contacting us about what seems to be a recurring concern. Our growing popularity has increased the number of items checked in each day, which, when coupled with the human factor, can lead to mistakes. We are working toward better efficiency by means of the recent change in our RFID circulation system, and the imminent addition of automated equipment. We’re sorry for the inconvenience and thank you for your patience.