Colo. Rev. Stat. § 35-44-104
If the brand commissioner appointed by the state board of stock inspection commissioners is unable to determine from the brand records and description who is the owner or probable owner of any reported estrays, he shall cause notice showing a facsimile of the brand and other identifying characteristics carried by the estray to be posted in the offices of all county clerk and recorders, and licensed livestock markets and in other conspicuous places in the area where said estray was found. Said livestock notice shall state when and where the estray animal was taken into custody. In addition the brand commissioner shall cause a notice giving a general description of the estray to be placed in a local newspaper within the county where the estray is held, and said notice shall be carried in one regular issue only. Both notices shall state that unless the animal is claimed by the legal owner within ten days after the publication or posting of the notice, whichever is later, then the same shall be sold by the state board of stock inspection commissioners for the benefit of the owner when found.
C.R.S. § 35-44-104