Traveling with Tirzepatide?

I don't have a letter or my prescription and the pen cartridges aren't labeled. I brought them in the country from brazil with no problem. Worried about taking them from the US to Japan. I'm going to be there for a few months. But i'm only going to take a month's supply which would be 4 cartridges, each 10 mg. Should I be fine or should I not even try? Can I just throw them in my shaving kit with the needle tips and not worry…
Has anybody else done this without a prescription or paperwork.

by SceneMission5234