N.D. Cent. Code § 9-09-08: Cancellation or destruction of contract - Effect

The intentional destruction, cancellation, or material alteration of a written contract by a party entitled to any benefit under it, or with that party's consent, extinguishes all the executory obligations of the contract in that party's favor against parties who do not consent to the act. When a contract is executed in duplicate, an alteration or destruction of one copy while the other exists is not within the provisions of this section.