I hope this message finds you well. I am writing to inquire about the delivery status of a letter I sent from Budapest, Hungary, to Duke Kunshan University, UG Residence Hall F, 3F, Duke Ave 8, Suzhou, Jiangsu Province, China. The tracking number for the letter is RR517066906HU.
As per the tracking information, the letter is currently in Beijing. Could you please provide me with an estimated delivery time for my letter?

Thank you for your assistance.

I sent a letter to Shandong university,the tracking status says it was delivered on 11tg but the recipient has not yet gotten it.

Respected,
The shipment number that you submitted to us in the inquiry does not represent the universally accepted designation and number for registered postal shipments, which are used by all postal operators, including the Post of Serbia. Please submit in a customized format: two letter designations - nine digits - two letter designations.
Thanks in advance!

Boyana