Colo. Rev. Stat. § 1-13.5-905
If the ballots to be furnished to any election judge are not delivered by 8 p.m. on the day before election day, or if after delivery they are destroyed or stolen, the designated election official shall see that other ballots are prepared, as nearly in the form prescribed as practicable, with the word "substitute" printed in brackets immediately under the facsimile signature of the designated election official. Upon receipt of the substitute ballots, accompanied by a written and sworn statement of the designated election official that the same have been so prepared and furnished by him or her and that the original ballots were not received or were destroyed or stolen, the election judges shall use the substitute ballots at the election. If for any cause none of the official ballots or substitute ballots prepared by the designated election official are ready for distribution at any polling place, or if the supply of ballots is exhausted before the polls are closed, unofficial ballots, printed or written, made as nearly as possible in the form of the official ballots, may be used until substitutes prepared by the designated election official are printed and delivered.
C.R.S. § 1-13.5-905