Glad Flutter is doing so well after surgery. Poor Harry, he will forgive you later tonight.
The control substance patch, any more vets, doctors and dentist have procedures to follow when it comes to those types of pain medications. There are idiot kids and adults out there that would go through trash cans just to find that stuff. As for vets offices they probably have to account for all patches they use thats why they want the old one brought back to them.