Wyo. Stat. § 21-13-103
The treasurer of each school district shall on the first Monday in April of each year cancel all unpaid warrants of such school district which have been issued for a period exceeding twelve (12) months, and shall at the same time certify to the board of trustees of such school district the number and amount of each warrant which he has canceled. Such list of canceled warrants shall be entered in the minutes of the board and published at least once in a regular issue of a newspaper published in the county, during the month in which such warrants were canceled. Any person or persons holding a school district warrant which has been canceled under the provisions of this section, may present such warrant to the board of trustees of such school district at any subsequent time, not later than five (5) years after the date such warrant was canceled. The said board of trustees shall issue to the holder of such school district warrant, a new warrant covering the amount due on the original warrant at the time so canceled.
W.S. 21-13-103