I think its schedule would probably be 831 rather than 833. In the morning session,
I saw that 833 was a double decker bus (which is normally departed from Tin Fu at 07:02).
And the photos I saw in B3 (taken in the afternoon) are well matched with the schedule
of 831:
From Tin Fu: 15:47, 17:50
From Tuen Mun Ferry Pier:16:47, 18:45