I did the same thing the day my chicks shipped. I called my local post office to give them a heads up and the person I spoke to there let me know that they’d be held at the local central distribution center, where it was, and how to contact them.
Try giving your local office a call and see...
This is what my small order from Meyer Hatchery looked like, similar to the above pic.
I have no fear that the workers handling the box knew there were live animals in there and to take care of the box. I heard them as soon as I walked into the post office to pick them up. The postal...