Yeah, only the China Post tracker registers anything. When I input the number in USPS tracking I get "There is no record of this item." When I check NZ post, I get this:
Item delivery status for RR824171050CN
Please note: The current status your Tracking number is displayed in bold below.
Time Date Status
08.38 AM 15/12/10 Picked up
08.35 AM 07/01/11 Left country of origin
04.43 PM 06/01/11 Arrived in New Zealand
Your item has arrived in New Zealand.
WTF?