Article 801 Federal Labor Law

The interested parties shall present the originals of the private documents and, when they form part of a book, file or bundle, shall exhibit a copy so that the part they indicate is compared, indicating the place where they are located, and must justify the circumstance by which they cannot exhibit them before the Court; in this case the judge may commission a court officer or secretary to attest to the particulars of the evidence, observing as applicable the provisions of articles 827 and 829 of this Law.