The "geheimnisvolle notiz" was actually a code to get 20% off Risen 2 artwork

It doesn't seem to be personalized. It's TAOGRISEN2 for
http://www.the-art-of-games.com
But the troll was definitely worth it. A complete guide with artwork was also included and a pen, that looks like a bone. And the other story DLC was included as well (which I would have bought anyway and that DLC costs 10EUR in PSN store). The treasure box was made out of paper sadly.
And it wasn't just released in Germany. It was released in Switzerland + Austria as well.
Yeah, but I got it for 30EUR

And I was able to sell the additional CE that was also included.