How to find the Usps express inquiry through USPS international surface mail: LC32447004 1US ~ Please help me with the inquiry, thank you ~

According to the official website of the US Postal Service (USPS), mail classified as beginning with LC belongs to international first-class mail. When this kind of mail is sent in the post office, there will be a set of numbers starting with LC on the receipt, and the format is "LC+ nine digits +US". This group of numbers didn't play the role of tracking inquiry, which means that international surface mail is nowhere to be found. When you look up such numbers on the website of the US Postal Service, the results will tell you when and where the mail was received, and then there will be no new news, no mailing progress and no delivery status.

Therefore, when using international surface mail from the United States to China, I sometimes feel that the mailing speed is slower than usual, but there is no way to inquire, so I have to wait patiently.