Mac,
This is great info!!! I am getting this cheap twin blow up bed from Walgreens, and going to leave it there when we leave.
Each trip I leave things in the room as I have no need for my left over snacks, soda, water, books I brought to read during my stay or clothes if I can't fit them in my suitcase
I am guilty of overbuying at the parks
But I talk to the housekeeper in advance if she would like to have the items I am leaving behind
She always says yes
If housekeeping finds items left in my room, they are required to turn it in
I would be contacted later to let me know they found a book, etc and make arrangements with me so they can return it
So if you leave an air mattress, leave a note in your room they can have it so you are not notified they are holding something you left in the room
A verbal statement to the housekeeper is another way housekeeping and keep an item
I stay at rpr and would assume the other hotels may follow this same policy
More than likely if you left water or soda bottles not opened, they would assume you left that on purpose if you were flying home
(If you did not have car parking fees on your account, they would assume that)