Me. Rev. Stat. tit. 21-A, § 609

The Secretary of State shall furnish each municipality with tamper-proof ballot security containers that are equipped with a suitable method of securing the ballots against tampering, which must be used for securing used ballots and other election materials for statewide elections conducted under this Title. If a state-supplied container or security mechanism becomes defective, lost or destroyed, the clerk must apply in writing to the Secretary of State for a replacement. The Secretary of State shall supply or approve a replacement at the expense of the municipality. If a municipality wishes to use a tamper‑proof ballot security container to seal municipal election ballots and materials, that municipality must obtain the container and security mechanism at its own expense.