I have a captured Soldbuch I inherited from a great uncle who fought for the 99th infantry. I was wondering if I would have any issues with German customs if they found it?

Is there any place I can go near Munich to conduct any research to see if this person survived the conflict? My wife and I have debated for years whether we should attempt to find the owner or his family to return the book. My great uncle was an "old man" when he entered service, he passed away before I really knew him or ever spoke to him. Not unlike many, he never really shared too many of his experiences with anyone. Pity, knowing what I know now, I would have loved to sit down with him and just talk.

All the best……any help would be greatly appreciated.