You can track your parcel there China post tracking Last Data:
"Zhengzhou Processing Center" has been imported mutual seal (domestic)
Viet Nam 2017-10-18 19:46:38.0 "Zhengzhou" has been imported to open and
dismantle Viet Nam 2017-10-18 14:09:48.0
Some time it happensWait several days and try to track again.Some
tracking system do not refresh data several days. BTW I use China Post
Trackingthis site show me actual information always w/o delays.
I see there
https://chinapost-track.com/track-china-post?track_number=RM924300004CN"The
Zhengzhou Exchange Bureau" import each other (internal transit)
2017-10-18 19:46:38.0
