We are always on a flight at 11, so we are on the bus before 9am. Disney knows this, they check us onto the bus. For people who leave later than that, then bell services is presumably storing your luggage, and can let housekeeping know. If you took your own car and put your things into your car at 9am before heading to the parks, you probably should tell housekeeping. Staff keeping staff informed is called customer service. Disney used to be good at it. If we let them off the hook, we have only ourselves to blame.