Official data: RB567604112CN 2013 NULL PEK CL 20130704 0401

2013 NULL PEK CL 20130704 0401 almost a month since collected at origin in China. Package was sen to Chile. Status not updated since July 4. Still not received in Chile, their system says RB567604112CN does NOT exist. I have already been told to be patient.
Can you please explain
why it says NULL and
what is PEK
Will I ever receive it?
Please do not waste your time telling me to be patient. I want to know the meaning of NULL and PEK in the China tracking system.

Thanks,