Just a guess, but when Apple releases an updated model, they call back all of the inventory of the previous model from the retail stores, to be sold in the refurb store, even though it's new (and not refurb'ed).
I wouldn't imagine that they'd ship that stuff from the stores back to China, just to ship back to a customer.
So hopefully when you get yours, it'll be in a new white box, not the refurb brown one. 🙂