Duplibox

Description
The Duplibox is a magician's style box. Anything placed into it will duplicate inside the box when its closed. After a period of time depending on the Duplibox's magical charge, and the size / magical strength of the object being duplicated, the duplicate will collapse into goo. Until this happens, it is impossible to tell which object is the duplicate vs the original. Usually, this lasts a few days. Each object can only be duplicated once; neither the original nor the duplicate can be duplicated again until the duplicate fades.

If a living creature is duplicated, the duplicate becomes a body for Box. Instinctively, it will act as a copy of the original, but may reveal its true colors with time.

Trivia

 * Eating duplicated food is a REALLY bad idea, and may cause physical injury as small portions of your body turn to goo.