Upon the final conviction of the accused, the city attorney must cause any writing, paper, book, picture, print, design, figure, still or motion picture, photograph or negative thereof, photocopy, engraving, sound recording, card, instrument or other thing which is obscene, or which tends to corrupt the morals of the youth, in respect whereof the accused stands convicted and which remains in the possession of and under the control of the city attorney to be destroyed. (Prior code § 12-10-7)