The forged papers, as well as many artworks survived (winter scene shown in blog header above). The story has now been compiled, along with images of these artworks, in the following book:
The Power of a Paintbrush
Also in German: Die Macht des Pinsels
The cover of the book features the prison release papers, front and back, enlarged to show detail. The stamp, the signatures and what appears to be authorized names and dates were all meticulously painted with a fine brush.
Available through SaskBooks https://www.skbooks.com/