The ballots, together with the other certificate with the poll list and tally paper to which it is attached, shall be:
(a) Sealed by the inspector in the presence of the judges and endorsed “Election returns of (naming the precinct) precinct.”
(b) Directed to the secretary.
(c) Immediately delivered by the inspector or some other responsible carrier designated by him, to the secretary.
(d) Kept by the secretary unopened for at least six months.