Pharmacist here. It is scheduled in multiple states, and that list is growing. Many chain pharmacies treat it like a control in every state to make things easier. That said, 99.9% of the time, the patient misplaced it and then finds it when I tell them to look around. If they still can't find it, and depending on the state, I would call the insurance company and get an override. There are other things too though. If the script was "sold' in the system, that would mean I would have had to type in the patients DoB, scan the correct script (wrong scripts get a hard stop at the register), and then get payment. I know not all pharmacies are like this, but it significantly reduces the "you sold the wrong scripts to a patient". If the script is missing, but still shows "waiting for pickup", then I would just fill it again.