There is one in TST has Patrick Cox Bags, they sell original brands and the shop owners go to Japan to get the goods themselves, they guarantee the goods are all genuine and if there is any suspect, you can check with the HK Customs.
Shop : Chocolate mimi
1/F., Hankow Road, Tsimshatsui, Kln
Tel : 2317 4333
(MTR A1 Exit, just next to 7-Eleven Stairs)