1. This is the tracking of your parcel:
Number: CP343898986CN
Package Status: Alert

Destination Country: United States
2017-01-04 13:27 CHINA, SHANGHAI, Processed Through Facility, Your item has been processed through a facility in SHANGHAI, CHINA at 1:27 pm on January 4, 2017.
2017-01-03 14:19 Origin Post is Preparing Shipment
2017-01-03 14:19 CHINA, Acceptance

Origin Country: China
2017-01-09 16:06 Express delivery of bulk acceptance service, has been voted
2017-01-08 16:24 Shanghai Exchange Bureau, import each other (internal transit)
2017-01-08 16:22 Shanghai Exchange Bureau, returned
2017-01-08 15:39 Shanghai Exchange Bureau, import opening
2017-01-08 13:58 Shanghai Exchange Bureau, import opening
2017-01-05 00:32 Shanghai Pudong, left hand navigation
2017-01-05 00:31 Shanghai Pudong, reach
2017-01-04 12:14 Shanghai Exchange Bureau, have been exported to open
2017-01-04 12:13 Shanghai Exchange Bureau, have been exported directly
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2. For whatever reason your parcel never departed China and was sent back to seller and was deliver to him.

3. This is where some thing happen:
2017-01-08 13:58 Shanghai Exchange Bureau, import opening
2017-01-05 00:32 Shanghai Pudong, left hand navigation

4. Import meaning coming back to China. Here is few place for maybe some explanation:

What does “Import Security Scan” mean?

What does “Import Customs Scan” mean?

China Post Forbidden Item List

5. You should contact seller as soon as possible to find out what happen to the parcel.

Thanks.