As stated, there is a possibility of being stopped going through Customs. Of all the trips I have made between HKG-PEK, I have been asked four times to put my luggage through the scanner and one of those times, a full baggage inspection.

Just a guess, they look for passengers from HKG/SEL for shopping trip junkets. I came trough SEL a couple of months back and saw lots of LV, Gucci ect boxes near the garbage cans at the airport.