Why does my tracking info now say null!?

I ordered something from China last month to the US and SF Express is shipping it. I check my tracking info everyday and the other day it crossed the US border and into Los Angeles. Being forwarded and dispatched.. My question is why does it say "null" now? I ve read somewhere it means transferred or to... show more I ordered something from China last month to the US and SF Express is shipping it.
I check my tracking info everyday and the other day it crossed the US border and into Los Angeles.
Being forwarded and dispatched..
My question is why does it say "null" now? I ve read somewhere it means transferred or to delivered to airport??
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