If a booking request releases its release time before staff have had a chance to pull the item, I believe Alma's default behavior is for the Requests – Handle Expiration job to assign Missing status and to send a FulCancelRequestLetter stating that the "Requested material could not be located". This causes patrons, who sometimes pick same day booking release dates, to think we've lost their requested items. A better cancellation reason would be BookingReleaseTimePassed/Booking request passed its release time.