37.—(1) The returning officer must keep securely one or more ballot boxes for the receipt of ballot papers.
(2) Every ballot box referred to in paragraph (1) must be marked “ballot papers” and with the name of the election, the date of the day of the count and constituency for which the election is held.
(3) Every return envelope received by the returning officer before 4.00 p.m. on the day before the day of the count (other than those returned under regulation 32(2)) is to be placed in a ballot box.
(4) Every such ballot box must not be opened before the counting of the votes under regulation 38.