We have a number of caskets in the house, two of them rosewood. My wife likes these little boxes, often shaped and made of fine woods and sometimes with ormolu, inlay, mother of pearl and other decoration. Some were for jewelry, some for miscellaneous, others for letters and some for tea (tea caddies) and converted; especially common before 1900. A small chest, for jewels, etc., is the primary definition in Webster's Collegiate Dictionary. It is also the primary definition in the Oxford.
I had to look it up to check current meaning because, being older, I sometimes use words that used to be common but are not known to my grandchildren.