The shipment contains only 16 ordinary T-shirts and the sender attached an invoice to the shipment, so I do not understand why it did not pass through security check.

2019-12-23 16:00
Beijing, send to import customs
2019-12-23 15:57
Beijing, [Beijing Post International] Returned, Remarks: Security check returned
2019-12-23 09:15
Beijing, leave [Beijing Exchange Station], next stop [Beijing Post International] (via transit)
2019-12-22 17:20
Beijing, [Beijing Exchange Station] Return
2019-12-09 06:38
Beijing, Airline transported
2019-12-09 06:37
Beijing, Airline transported
2019-12-08 15:36
Beijing, [Beijing Post International] Directly Exported

I ordered two items. One is fine. The other is the wrong size. Too small. Would like to return and exchange. How do I do this ? Where is the return address?

How do I address a return package with this return information?
Return address: Nangang Second Industrial Park, No. 1026, Songbai Road, Xili Street, Nanshan District, Shenzhen, Guangdong Province, China
Recipient: Mr. Xiong
Zip: 518000
Tel: +86 17817017665