Which state is your home state? Were you temporarily in WY or actually living there with no home maintained in CO?
If you did not live at all or work at all in CO, then you would file a non resident return to claim the taxes they erroneously withheld if they withheld taxes. To do this you would enter $0 as your income and then leave the amount of taxes withheld as the amount actually withheld.
If you did not live or work at all in CO, and they did not withhold taxes, then you would not file a CO return.
If you did maintain a home in CO as your primary resident state and were only in WY temporarily for work, then you would be liable for taxes in CO.
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