Section 30. The city or town clerk shall furnish to the clerk of each voting place or precinct a seal of suitable device with a designation thereon of such voting place or precinct; and such seal shall be used in sealing all envelopes or other containers required by law to be used at elections. The clerk of the voting place or precinct shall retain custody of the seal, and shall, at the end of his term of office, deliver it, with the records of the voting place or precinct and other official documents in his custody to the city or town clerk.