China Post tracking status "NULL". Tracking number is RB671908020CN.

I'm having a package sent from China to British Columbia, Canada. I know that it will take a while to get here, but for the last week the tracking status has been "NULL". Is this because it is just sitting at the airport or am I unable to check it through China Post once it leaves China?
If anyone can help me figure this out I would really appreciate it.

Thank you!