For the purpose of §§ 10-208 and 10-209 of this subtitle, any finding, report, or record, or duly certified copy of a finding, report, or record, purporting to have been signed by an officer or employee of the United States described in §§ 10-208 and 10-209 of this subtitle, shall be presumed to have been signed and issued by the officer or employee in accordance with law, and the person signing same shall be presumed to have acted within the scope of the person’s authority. If a copy purports to have been certified by a person authorized by law to certify the copy, the certified copy shall be evidence of the person’s authority so to certify.