The term "memento case" refers to a box or container used to store keepsakes, souvenirs, or reminders of a particular event or person. There are several synonyms that can be used to refer to such cases, including memory box, keepsake box, souvenir box, remembrance box, memory chest, commemorative box, and nostalgia box. Each of these terms conveys the essential idea behind the memento case, which is to preserve memories and feelings associated with a specific person, place, or occasion. Whether it's photographs, letters, or other sentimental objects, a memento case is a way to cherish and remember important moments in life.