The election officers shall, after taking the oath, open the ballot boxes which have been furnished to them, before opening of the polls. Not earlier than one hour prior to the opening of the polls, but subsequent to compliance with section 153 of this title, the seals of the packages furnished or forwarded by the Board of Elections shall be opened by the judge of election. When the polling place is opened, the ballot boxes shall be securely locked, and shall not be opened until the close of the polls as provided in this title, The cards of instructions provided under section 514 of this title shall be immediately posted in each voting compartment and not less than three of such cards shall immediately be posted in or about the voting room outside the enclosed space. In addition, not less than five sample ballots of each political party, if a primary is being held, and not less than five sample ballots, if a general election is being held, shall be posted in and about the polling place outside the enclosed space. Also, such cards of instructions and sample ballots shall be given to any elector at his or her request, as long as there are any on hand.