USPS can track China Post Register Airmail, EMS, ePacket and Sea/Air combined parcel where are shipped from China to USA.

But USPS can not track China Post Ordinary Small Packet and China Post Direct Xpress Mail Parcel even if the parcel destination is USA.

Here is the table of different China Post parcel category tracking ability in USPS.

China Post Parcel Category	13 digits Tracking Number Format	USPS Track Ability
China Post Register Airmail	R**********CN
China Post ePacket Parcel	L**********CN
China Post EMS	E**********CN
China Post Sea/Air Combined parcel	C**********CN
China Post Ordinary Small parcel	U**********CN
China Post Direct Xpress Mail	A**********CN

Examples:
RW302660358CN , format R**********CN which is China Post Register Airmail.  China Post Tracking Result shows it was shipped on 03/30/2020 from Guangzhou and arrived USA on Aug 21, USPS tracking result  shows it was delivered on Aug 26 by USPS.

LY065394372CN, format L**********CN which is an ePacket. China Post Tracking result shows this parcel was shipped from Fuzhou on Mar 25 and was delivered on Aug 11  in USA. USPS tracking result  shows this parcel was delivered by USPS in Detroit on Aug 11.