Colo. Rev. Stat. § 1-13.5-807
In a local government election in which an electronic voting system is used, the designated election official shall distribute to the election judges in the respective polling places a sufficient number of ballots. The ballots must be placed in one or more sealed packages for each polling place with marks on the outside of each stating clearly the polling place for which it is intended and the number of ballots enclosed. Such package shall be delivered to one of the election judges of such polling place no later than the day before the election. A receipt for the delivered ballots must be given by the election judge who received them. The receipt must be filed with the designated election official, who shall also keep a record of the time and manner in which each of said packages was sent and delivered.
C.R.S. § 1-13.5-807