https://praguepig.com/2017/12/balloon-powered-jezisek-letter-released-by-boy-in-sezimovo-usti-south-bohemia-is-found-in-poznan-poland-poles-track-him-down-and-plan-to-grant-his-christmas-wishes-idnes-cz-facebook-post/
Balloon-powered Jezisek letter released by boy in Sezimovo Usti, South Bohemia is found in Poznan, Poland; Poles track him down and plan to grant his Christmas wishes (iDNES.cz) [Facebook Post]