In any case where a trustee company is acting jointly with another person in any of the capacities mentioned in subsection (1) of this section, a certificate issued in accordance with the provisions of that subsection by the company under the seal of the company or of a local or special Board of Directors of the company shall, notwithstanding any enactment or law to the contrary, be accepted by all Courts, officers, and persons, whether acting under any Act or not, as sufficient evidence of the facts set out and authorised to be set out therein, and of the appointment of the trustee company and that other person, and of their right to administer or act, without any other proof whatsoever. It shall not be necessary for the certificate to be executed by any person with whom the trustee company is acting. References in subsection (2) of this section to a trustee company shall be deemed to include references to a trustee company and any person or persons with whom the trustee company is acting”.