Sorry to hear about that!
I realized again how easy it is to go to the PO and forward mail when I did it a couple of weeks ago for our move. I did not have to show ID and I think I even offered to.
And yes, it is ALL at the local office which is a pain in the keester. I ordered my three month supply of meds over 2 weeks ago from PA and it never made it to our old address and now it is just circling somewhere out there. It is probably sitting at the PO where we use to live but I hate driving up there all the time to try and find my mail!! For those of us who actually WANT their mail forwarded in an appropriate and timely fashion, it does not seem to happen either.
I guess at the very least the USPS does send a notice to both old and new addresses in case there is a mistake or in your case, foul play.
Hope the rest of your week goes better and I hope to get my meds soon!!