9. It shall not be necessary, after any such declaration under oath, or a certified copy thereof, has been produced in evidence as aforesaid, against the persons who made and signed such declaration or are therein named, or any of them, and after a newspaper, pamphlet or other such paper is produced in evidence, intituled in the same manner as the newspaper, pamphlet or other paper mentioned in such declaration or copy is intituled, and wherein the name of the printer and publisher, and of the place of printing are the same as the name of the printer and publisher and the place of printing mentioned in such declaration, for the plaintiff, informant or prosecutor, or person seeking to recover any of the penalties given by this act, to prove that the newspaper, pamphlet or paper to which the suit or trial relates, was purchased at any house, shop or office belonging to or occupied by the defendant or by his servants or workmen, or where he or his servants or workmen usually carry on the business of printing or publishing such newspaper, pamphlet or other such paper, or where the same is usually sold.