what is Null? can you help me check this RB221958946CN

I had checked for what NULL means - it means item is in Airport.
I and you have same tracking information for our items,
My item is also in Guangzhou airport sine July25.
RA622596229CN and RB647904345CN (also order to Malaysia)
Looks like Post of China trying to collect as much mails/parcels as possible to send all at one time.

And else, in such situation sender can not help, Malaysian post also helpless as the items are not in Malaysia yet.
It is fault of Chinese post office-but I think they never bother about customers