I generally leave a few bucks for the housekeeper on the tv stand upon checking out. Last trip I found myself in possession of three bottles of liquor thanks to promotions at El Cortez and the Stations. I do like my booze but I dont need to bring home a complete bar set in my suitcase.
I ended up leaving the housekeeper a nice bottle of unopened Jose Cuervo Silver along with her normal tip - but I wondered if she would keep it or throw it out....or if she had to forfeit it to the hotel or something.
I also frequently leave behind whatever coupons I end up not using - I figure they might like the discount buffets.
I'm sure every hotel has their own rules - but does anyone know the policy in general?