According to the U.S. Government, Fort Knox holds 147,341,858.38 Troy Ounces of Gold (see: https://www.fiscal.treasury.gov/reports-statements/gold-report/21-02.html)

This market will resolve to “Yes” if it is confirmed that Fort Knox holds less than 147,300,000 troy ounces of gold between February 17, 2025, and June 30, 2025, 11:59 PM ET. Otherwise this market will resolve to “No”.

If gold is removed from Fort Knox after February 17, 2025, this will not qualify for a “Yes” resolution. If an audit confirms that there is no gold missing from Fort Knox, or that it otherwise contains 147,300,000 troy ounces of gold or more, this market will resolve to “No”.

The resolution source for this market will be official information from the U.S. Government, including the Department of Government Efficiency.