N.D. Cent. Code § 47-07-14
Every nonprofit or noncounty museum in this state which is loaned or receives by donation any object for public display or safekeeping must keep a record of those objects. The record must indicate the owner or owners of the loaned objects and their addresses. A duplicate of the record must be filed with the county in which the museum is located. The board of directors or any person in charge of a museum which is closing or closed must return loaned objects to the recorded owners. All unreturned or unclaimed objects must be retained for two years to ensure that individuals have the opportunity to reclaim loaned objects. After that time, unclaimed objects may be disposed of at the discretion of the board of directors or person in charge of the museum.
N.D.C.C. § 47-07-14