The place where public, government or historical records are kept

One word substitute is Archives.

Coffer: a strongbox or small chest for holding valuables.
Pantry: a small room or cupboard in which food, crockery, and cutlery are kept.
Scullery: a small kitchen or room at the back of a house used for washing dishes and other dirty household work.
Archives: a collection of historical documents or records providing information about a place, institution, or group of people.