This is a film case for negative film. It is a set of 6 empty cases after use. As shown in the photos, the cases differ depending on the manufacturer. They are likely Fujifilm and Kodak cases. They can be used in various ways depending on your ingenuity, such as for coin storage or seed storage. They were stored indoors, but please be aware of age-related deterioration and graffiti (which may be removable with nail polish remover, etc.).