Ozzi might have a point here but surely you don't let the resort or boat crew do anything with your camera? I do the rinsing myself and grab the camera as soon as out of the water
interesting to know though I would go back to each trip you did and figure out how the camera was handled each time
the only boat dives i did with it was last august in the farnes, and i rinsed the camera in the sink when i got back to the room, i had also got for few trips to swanage in a camper and im not sure if it got rinsed there until i got home as not having somewhere to do it.
otherwise i handle the camera myself, put it in the dive centre camera rinse tank, and then soak it well when i get home. if im doing a dive here [uk] i soak it afterwards for hours/days.
i will post some more pics