Yes, they does, I have checked one of these books down here and sure enough, it is mentioned.
I was thinking in the back of my mind - a staff at the hotel (I forgot the name
) in NYC, whether helped or not with my luggage when I got off from the cab into the hotel. If it really did happen, I forgot to tip
It must be a foriegn side of me 
Yeah, same when I saw in Japan - there is a sign at the hotel, if you rather keep the sheets, leave the note on the bed and the maid won't do it.