Actually I always took the 5 or 6 pm flight and I arrived at airport early say like 1 pm for tax refund.So the visit at H store were like 2 pm something.
Dont go in the morning as they dont get delivery so early.
Dont go too late as there will be some evening flights to China so it will be crowded, including tax refund.
Well, its just all by luck, whether they get delivery that day and if they do, do they have the bag you want, and do they want to sell to you.
I had always been lucky at this place, bought 2 C, 1 26 Magnolia Lindy, 1 30 electric blue GP. They were all inside the stock room and had to ask them politely.
However, no luck for me at any H in the city.
Few years ago, spot a 30 croc purple B at H Bond St for sale (no 'display only' at that time) but unfortunately its with diamond costing around HK$1mil. Its not a bag I can afford or I want.