Documents filed in Registry Office
87Where any document is authorized or required by law to be filed in the office of any registrar of deeds, a writing purporting to be a true copy of such document, and to be certified by such registrar under his hand as having been filed in his office, and to be a true copy of the document so filed is, in all courts, evidence of the filing of such document; and if such certificate certifies that such document was filed at any time, or on any day, it is evidence that the same was filed on the day or at the time so specified.