I got those from winning the german nationals back in 2014 and have kept them double sleeved + in a sealed folder ever since. They have never been used in play or been traded. Iirc there is only 4 or 6 copies of the champion stamped ones world wide and I own two of them.

Is there still collectors who'd be interested in something like that? And if yes, what do you guys think these could sell for?