AQ015826628CN was handed off to USPS however they can not help me with out their tracking number. Can you please give me the USPS tracking number. My package shows to have been delivered on July 5 however I have not received anything. USPS can not help me with out said tracking number.

My package RD592944475CN has been 'in-transit' since 1/6/2021 at ISC New York, NY(USPS) I contacted USPS several times and they told me that the place of origin has to provide an update since it has not been cleared at custom in the US. Please help, who should I contact to get it cleared? Or at least what steps should I ask the sender to do in China?
Thank you.

Tracking number AT367065908CN
USPS SAYS THEY NEED THE USPS TRACKING NUMBER THAT IT WAS GIVEN IN LOS ANGELES CA THEY HAVE NOTHING FOR THIS AND NO PKG DELIVERED TO 10646 FISHBACK ROAD LEESBURG, OH 45135 WHERES THE PKG