to be sure about it being empty, you need to turn it to test, then hold the r button to rewind the film, if it doesnt rewind, then they are ok, or you go into your bathroom and shut the lights off and put a towel over the bottom of the door and open it up and feel if its empty, if not, do like i said and turn it to test and hold the rewing button until it is fully rewound. i messed up my first roll...lol so i made sure i knew.