What is the ruling on the family possessing old photographs of a woman without her hijab, given the inability to retrieve all of them?

You must do your utmost to retrieve your pictures in which you appear without hijab from whoever possesses them, and you may seek help from some of your relatives. If you retrieve these pictures, you must destroy them. If you exert your effort but are unable to retrieve some of them, then that will not harm you, Allah willing; as Allah Almighty says: ﴿So fear Allah as much as you are able.﴾