13 Pa.C.S. § 1307: Prima facie evidence by third-party documents.

A document in due form purporting to be a bill of lading, a policy or certificate of insurance, an official weigher's or inspector's certificate, a consular invoice or any other document authorized or required by the contract to be issued by a third party is prima facie evidence of its own authenticity and genuineness and of the facts stated in the document by the third party.