Where the carcase of any sheep or lamb, or the head, skin or any part thereof, or any fleece thereof, is seized by any person pursuant to section 25(3), any person in whose possession or on whose premises any such carcase, head, skin, part or fleece is foundF1 if he fails to satisfy a court of summary jurisdiction that he came lawfully by such carcase, head, skin, part or fleece shall, on summary conviction, be liable to imprisonment for a term not exceeding six months or to a fine not exceeding one hundred pounds, or to both.