Effectively there will be no consequences. Technically Zwiebelfreunde could file charges against the judge who signed the orders or the police who executed them, but effectively they will not be prosecuted, let alone convicted. Nearly all illegal police activity in Germany had no real consequences, because there is a „high trust” in them by ruling parties.

Some examples from the last year:

http://www.spiegel.de/panorama/justiz/g20-polizei-soll-recht...

https://www.hessenschau.de/panorama/durchsuchung-des-asta-st...