"Null pvg" Status for 7/21/2013 and 7/31/2013 when I track package to US.(RB364722582CN)

Hello,

Today is July 31, 2013. My package is coming from China and had the "NULL PVG" status entered on July 23 and again today, July 31:

item No. Year Status Location Destination Country Date
RB364722582CN 2013 Collection 51810302 US 20130721 0100
RB364722582CN 2013 Waiting for transit airline Space 51805300 US 20130721 1237
RB364722582CN 2013 Departure from China 51805300 US 20130721 1407
RB364722582CN 2013 NULL PVG US 20130723 0800
RB364722582CN 2013 NULL PVG US 20130731 0628

The status on July 12 said "Departure from China, BEFORE the NULL PVG status. Does anyone have any idea where my package is now?

Thanks!