All such packets or samples shalt be signed by the accused or his agent, if he is availabié.

Every Excise or Police Officer making an investiga. Diary of tion under this Act shall, day by day, enter his proceedings 4 essing in the investigation in a diary, setting forth the time at gation. which he began and closed the investigation, the place or places visited by him and a statement of the circumstances ascertained from day to day until the investigation is closed.