1. This is a tracking that might help you:
Number: EC577217957US
Package Status: Undelivered
Destination Country: China
2016-11-02 09:28 In Shanghai, did not properly cast, reason: messages are sent to the wrong
2016-11-02 09:28 Shanghai Huaihai Zhong Lu (this part) arrangements delivery, expected delivery by 23:59:00 (Messenger name: Feng Yuxuan; phone: 18019025641)
2016-11-02 00:22 In Shanghai, customs clearance
2016-11-01 08:53 In Shanghai, did not properly cast, reason: messages are sent to the wrong
2016-11-01 08:53 Shanghai Huaihai Zhong Lu (this part) arrangements delivery, expected delivery by 23:59:00 (Messenger name: Yuan Zhenfei; phone: 18918381138)
2016-11-01 03:05 In Shanghai, customs clearance
2016-10-31 15:12 In Shanghai, did not properly cast, reason: messages are sent to the wrong
2016-10-31 15:12 Shanghai Xintiandi (this part) arrangements delivery, expected delivery by 23:59:00 (Messenger name: Jody sea; phone: 53068344)
2016-10-31 11:28 In Shanghai, did not properly cast, reason: the recipient is not in the specified address
2016-10-31 08:38 Shanghai Xintiandi (this part) arrangements delivery, expected delivery by 23:59:00 (Messenger name: Ren Xingjun; phone: 13818961291)
2016-10-30 17:43 In Shanghai, did not properly cast, reason: the recipient is not in the specified address
2016-10-30 17:42 Shanghai Xintiandi (this part) arrangements delivery, expected delivery by 23:59:00 (Messenger name: Shen Erlong; phone: 53821566)
2016-10-30 13:32 In Shanghai, customs clearance
2016-10-28 04:51 United States, leaving the treatment center, destined for Shanghai, China
2016-10-28 04:47 United States, reached the processing center, from the

United States, San Francisco
2016-10-27 14:24 United States, acceptance
Origin Country: United States
2016-11-02 09:28 CHINA, Item wrongly directed - Item forwarded / redirected, Your item could not be delivered on November 2, 2016 at 9:28 am in CHINA due to it being wrongly directed. It is being redirected.
2016-11-02 00:22 CHINA, Customs clearance processing complete
2016-11-02 00:22 CHINA, Processed through Facility
2016-11-01 08:53 CHINA, Item wrongly directed - Item forwarded / redirected
2016-11-01 03:05 CHINA, Customs clearance processing complete
2016-11-01 03:05 CHINA, Processed through Facility
2016-10-31 15:12 CHINA, Item wrongly directed - Item forwarded / redirected
2016-10-31 11:28 CHINA, Addressee not available - Will attempt delivery on next working day
2016-10-30 17:43 CHINA, Addressee not available - Will attempt delivery on next working day
2016-10-30 13:32 CHINA, Customs clearance processing complete
2016-10-30 13:32 CHINA, Processed through Facility
2016-10-30 03:40 CHINA, Processed Through Facility
2016-10-29 20:14 In Transit to Destination
2016-10-29 19:48 CHINA, SHANGHAI, Departed
2016-10-28 14:32 UNITED STATES, SAN FRANCISCO, Departed
2016-10-28 10:23 UNITED STATES, SAN FRANCISCO, Arrived
2016-10-28 04:51 ISC SAN FRANCISCO (USPS), Processed Through Facility
2016-10-28 04:47 ISC SAN FRANCISCO (USPS), Arrived at Facility
2016-10-27 18:14 OAKLAND, CA 94615, Arrived at USPS Origin Facility
2016-10-27 14:24 LIVERMORE, CA 94550, Arrived at USPS Origin Facility
2016-10-27 13:09 LIVERMORE, CA 94550, Accepted at USPS Origin Facility
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2. You better call them here:
2016-11-02 09:28 Shanghai Huaihai Zhong Lu (this part) arrangements delivery, expected delivery by 23:59:00 (Messenger name: Feng Yuxuan; phone: 18019025641)

3. If you don't your parcel will go back to USA. If you can not reach them, then call China Post EMS here:
Origin Country - China: 86 20 11183

Hope this help.