1. This is the full tracking of your parcel on the China Post EMS site:

2016-12-22 00: 00: 00.0 21:00:00 Guangzhou Post Express Logistics International Business Branch Received

2016-12-22 00: 00: 00.0 21:38:00 Guangzhou City to reach the processing center, from Guangzhou Post Express Logistics International Business Branch

2016-12-22 00: 00: 00.0 22:20:11 Guangzhou Post express logistics company international business branch to leave the processing center, sent to Guangzhou Terminal

2016-12-24 00: 00: 00.0 11:13:00 Guangzhou City to leave the processing center, sent to USJFKF = ISC NEW YORK NY (USPS)

2. Your parcel is not Express EMS delivery, your parcel is E Packet delivery. In normal very good condition E packet to USA can take between 1 to 3 weeks to be deliver.

3. Right now it's not normal condition because of slow down of Holiday Season, so parcel to USA can take between 15 to 35 days to be deliver.

4. This reading might help you out:

format 3: the number starts with “E” and ends with “CN”, i.e. EE123456789CN, EA987654321CN
This is China Post Express Post Service (EMS). Normally it is much faster than airmail and might take one to four weeks to arrive. The price is also much higher than airmail.

format 4: the number starts with “L” and ends with “CN”, i.e. LK123456789CN, LN987654321CN,LM123456789CN,
This is China Post ePacket parcel. It is almost as faster as EMS and only a little bit more expensive than airmail.
However, ePacket service is only available to limited countries such as USA, Canada, Australia,UK etc.

Thanks.