FRANKFORT — One of the rarest and most sought-after bourbon's produced in Kentucky is missing.Franklin County Sheriff Pat Melton says someone swiped about 65 cases of 20-year-old Pappy Van Winkle bourbon in what appears to be an inside job from a secure area at Buffalo Trace Distillery's Frankfort operations.Melton told The Courier-Journal whoever stole the bourbon walked off with about $26,000 of the limited stock. That's about $25,350 in 3-bottle cases of 20-year-old Pappy and about $675 in nine cases of 13-year-old Van Winkle Family Reserve rye.Melton told the Lexington Herald-Leader the bourbon retails for about $130 a bottle and is worth "$300 or $400 a bottle" on the secondary market.Spokesmen for the Buffalo Trace and the Van Winkle office did not return calls seeking comment.