What can happen if I’m accused of stealing evidence from police for falsifying police report?

From your question, it is a bit confusing what you are asking. In general, in the state of Colorado perjury in the first degree is a class four felony. Second degree perjury is a class 1 misdemeanor. What separates the two charges is if the statements were made during an official proceeding or not. It does not matter if the statements were oral (you allegedly said the statements) or written.