The next website you should visit is the Deutsche Akademie für Fussball Kultur.
An amazing resource for everyone interested in football in German and European society.
They also have a special page about Football Museums and collection. A real gold mine for Balls & Boots.
It also confirms Germany as the great nation of Football Museums alongside Great Britain.
I also came upon a Deutches Fussball Museum in Berlin. A little surprising because it seems to cover the same themes as the planned DFB Fussball Museum (the national museum of the German FA) in Dortmund.
So, I'll try to investigate further.
Meanwhile I have some German club museums to visit online and, look (guck mal) there seem to be another museum dedicated to a player in progress.