For the purpose of any proceedings before any court, if any question arises as to whether or not entry under the revenue trade provisions of the customs and excise Acts has been made by any person, or of any premises or article, or for any purpose, then—
(a)if a document purporting to be an original entry made by the person, or of the premises or article, or for the purpose, in question is produced to the court by an officer, that document shall, until the contrary is proved, be sufficient evidence that the entry was so made; and
(b)if the officer in whose custody any such entry, if made, would be gives evidence that the original entries produced by him to the court constitute all those in his custody and that no such entry as is in question is among them, it shall be deemed, until the contrary is proved, that no such entry has been made.