There is a COA for the jersey from the Twins. See the photos above and let me know if you have any questions.
The item "Brad Radke game used signed Minnesota Twins jersey MN autographed worn MN auto" is in sale since Saturday, March 28, 2020. This item is in the category "Sports Mem, Cards & Fan Shop\Game Used Memorabilia\Baseball-MLB\Jerseys". The seller is "ws8791sportsautographs" and is located in Las Vegas, Nevada. This item can be shipped worldwide.