You’re over analyzing it. These medications are prescribed all the time, especially for surgeries. They’re only concerned if you start filling multiple prescriptions for the same narcotics at different pharmacies. They aren’t going to care if you return the pills back. It’s just going to go into a pile with expired medications to get destroyed. I doubt they would make any record of it. You don’t have to take any painkillers if you don’t feel they are warranted. I didn’t take mine when I had my surgery. Once you have completed recovery, if you want to get rid of the medications, any pharmacy will carry the materials you need to destroy the medication safely. I don’t remember what it’s called offhand, but you can go to any pharmacy and ask for some packets of the stuff that destroys medications, and they’ll just give them to you.