Just got a neat little cheque from a german bank in the mail :-) "only" 3k, but absolutely awesome to have it all back.
Filed the petition late (may 2018), had a screenshot of my account balance, no known problems with my claim, asked by mail like two, three times since. always pretty meaningless answers until when I asked a few weeks ago. No mail this time, just money
Fingers crossed for everyone who's still waiting, hope is out there.