Presumption as to documents grants evidentiary truth to produced or seized documents unless rebutted by the accused. Where a document is produced, seized, or received from abroad and tendered by the prosecution, the court shall, unless contradicted by the person, presume the truth of its contents and that signatures or parts in a particular person's handwriting are genuine, including execution or attestation as purported; the court shall also admit the document in evidence notwithstanding it is not duly stamped if it is otherwise admissible.