A VIN verification is required before registering a vehicle in the City and County of Denver when the vehicle:
Denver Motor Vehicle performs VIN verifications and completes a Verification Vehicle Identification Number Form (PDF) (DR 2698 from Colorado Department of Revenue) during normal business hours at any branch office for $25.00 per vehicle (weather permitting).
Information about obtaining a Certified VIN verification can be found at the State of Colorado's VIN Inspection web site.