when the valet whisks off your luggage, he takes it around the corner and does weight it.....then see's if there is anything extremely over, he will come back and mention to the check in staff...generally during this time there is either small talk or alot of keys being pressed as the check in staff buys time..... but yes there is a good leniency with the luggage check in at F (at hkg as i dont know of any other cx vallet service at other airports)..