C.R.S. § 31-10-901

The governing body of each municipality using paper ballots shall provide 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 thereof and with a lid to be locked. The ballot boxes and keys shall be kept by the clerk and delivered to the judges of election within one day immediately preceding any municipal election, to be returned as provided in section 31-10-614 . Nothing in this section shall prevent the governing body from obtaining ballot boxes from the office of the county clerk and recorder.