i was wondering what nullpvg means

Question

here is my tracking number RB975953288CN if  it helps!!

Mr.MEP6677 · Answer

RB975953288CN Collection Shanghai SE Tue, 20 May 2014 10:54:00 GMT RB975953288CN Departure from outward office of exchange Shanghai SE Wed, 21 May 2014 10:04:00 GMT RB975953288CN Delivery to airport Shanghai SE Thu, 22 May 2014 21:36:00 GMT Your parcel was dispatched on Thursday 22nd May 2014 and is transporting to you

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I was wondering what null and PVG means