Q. If the status of a book states "Billed", does that mean the book has been checked out and not returned?
The Billed status indicates that a book has been checked out and overdue for long enough that the user has been billed for the book. The odds of the book ever being returned are low.
If there is a specific book you are looking for that has this status, please let us know so that we can consider ordering a replacement copy.