C.R.S. § 1-13.5-901

The governing body of each local government using paper ballots shall provide at least one ballot box for each polling place. Each ballot box shall be strongly constructed so as to prevent tampering, with a small opening at the top and with a lid to be locked. The ballot boxes and keys or seals shall be kept by the designated election official and delivered to the election judges within one day immediately preceding any local government election, to be returned as provided in section 1-13.5-614 . Nothing in this section prevents the governing body from obtaining ballot boxes from the office of the county clerk and recorder.