IME by mid day and CERTAINLY by early afternoon there are a bunch of floats around - unattended - as folks who rented saw no reason to return them when they went back to the boat cuz of sleepy kids or 100 other reasons ..... just sayin' ...... in other words this is not something you must "check in" to get a deposit returned so they just get left .....
this might be a bit different on a double dip .... but I doubt it ..... and my experience is not recent so things might have changed with regard to 'returns' but I doubt it ..... kinda hard to sneak one aboard to take home!!!