What is the term for an unfinished wood box or other non-metal receptacle designed for encasing human remains?

The term you are looking for is "alternative container." This term specifically refers to a simple, unfinished container that may be made from materials such as cardboard or wood, designed to hold the human body. It is an option often used in cremation services or for direct burial when a traditional casket is not desired due to cost, environmental considerations, or personal preference.

In contrast, the other terms for containers have different functions and specifications. A casket typically refers to a more elaborate interior-designed container often manufactured from hardwood or metal, intended for viewings and services. An outer burial container usually refers to a container designed to support the weight of the ground and may include a vault or grave liner. These are utilized to protect the casket and prevent it from collapsing into the grave. A grave liner is specifically a type of outer burial container that encases the casket but does not have a top.

Understanding the distinctions between these terms is crucial, particularly in the context of funeral service practice, as they have specific regulations and implications for service offerings and choices available to families.