Tracking number started with EA121626***CN

Hi,
I'm now dealing with a seller and she gave me three tracking numbers, and they all started with the same sequences and ended with CN. I already tried to track them but didn't get any informations. I read through the list but didn't see any service that started with EA (E is for ems..don't know about A). Very helpful if anyone can clear this up for me. Thank you in advance!