Arne always knows!
My stuff from Germany is still sitting somewhere between JFK and our fine US postal service. 3 weeks now. Losing hope. Somebody call someone and do something!
This happened to me once. I filed a claim online at USPS.com. Then, they go search. It started moving the next day, but the post office didn’t close the claim. I closed it once I got the item. Mine was coming from Ireland. The customs people are lazy. I think there is some informal system once you file a claim. They don’t want to get in trouble.
BTW, the Jamaica, NY (JFK) customs is the worst. I’ve heard others are better, but you don’t get to choose.