What part of "Do not disturb", don't you understand? The housekeepers love that sign, less work for them, and they usually get a nice tip when the guest checks out. Room service just knock and say "room service", which is how the guest ordered the food to the room service operator.
You have never stayed or work in a hotel from my summation.
Also, getting all that stuff up to his room, find a bellman with a bell cart, tip $100 and no questions asked.
So you’re saying he did in fact have that sign on the door?