QBIRD-
The US OP bottle has your name on it, right? If so, I wouldn't spend even one second worrying about it. International or domestic travel--if your name is on the bottle, it's a valid prescription. I don't think any airport/customs official would even know it WAS from an OP unless you told them. If they should ask why it is that you live in a state other than the one where the prescription was filled, just say it's cheaper for you to fill your doctor's prescriptions by mail order rather than using a local pharmacy. People do it all the time (and it is legal.)