Your registered letter has just been sent out, and it hasn't been scanned into the system by the postal staff, so you can't find the record for the time being. Please check it again tomorrow and the day after tomorrow. Baidu's "Tracking Query System for Receipts" opens the first column of the pop-up page and enters the number to check the mailing progress.

a registered letter will reach the recipient about one week after it is sent.

If I can help you, please choose a satisfactory answer to support me. Thank you!