Sealing of ballot boxes
29. Immediately before the commencement of the poll, the presiding officer shall—
(a)show each ballot box, empty, to such persons, if any, as are present in the polling station, so that they may see that the boxes are empty;
(b)lock up such of the boxes as have locks;
(c)place his seal—
(i)on each lock; and
(ii)on each ballot box which has no lock,
in such a manner as to prevent its being opened without breaking the seal;
(d)place each box in his view for the receipt of ballot papers; and
(e)keep each box locked and sealed or, as the case may be, sealed.