3 U.S.C. § 10 : US Code - Section 10: Sealing and endorsing certificates

Search 3 U.S.C. § 10 : US Code - Section 10: Sealing and endorsing certificates

The electors shall seal up the certificates so made by them, and
certify upon each that the lists of all the votes of such State
given for President, and of all the votes given for Vice President,
are contained therein.