When voting equipment has been properly prepared for an election, it shall be locked against voting and sealed, or if a voting or counting machine cannot be sealed with a numbered seal, it shall be locked with a key. The equipment keys and any electronic activation devices shall be retained in the custody of the general registrar and delivered to the officers of election as provided in § 24.2-639. After the voting equipment has been delivered to the polling places, the general registrar shall provide ample protection against tampering with or damage to the equipment.