I had checked with FedEx Shanghai and got the information as below:
1. This shipment must be arranged clearance as formal out-bond clearance;
2. If shipper is not an established company in CN, they must hire a broker agent to prepare clearance docs and arrange clearance;
3. There is no idea about “certificate of authorized export cargo (委托货物出口证明)” from ShangHai, and FedEx Shanghai said that shipper needs to offer the Power Of Authority out bond clearance(出口清关委托书);