Omamori, the lucky charms available at shrines, are usually returned once they have served their purpose, or if they are more than a year old. This is usually done over the New Year and before receiving a new one. As omamori are considered sacred items, disposing of them in the trash is discouraged. Instead, shrines set up boxes such as this one for believers to return their omamori, household ofuda (amulets), and decorative arrows. Returned items are then burned in a sacred fire.
Please note that this box may only be used for returning used amulets and talismans, and is not for rubbish.