Finally, I got all Passports back and valid.
To help other people if needed here are the procedures.
All lost items in FRA either lost in airport (small chance to get back) or in plane by cleaning staff ( big chances to get it back) are collected to the FRA lost and found center there you can get your items back by DHL when you pay the shipment cost (reply is slow but once they reply they work quick).
Except for Passports, those should be delivered immediately to the airport police and they send it back to the embassy of the country owned the Passports.
So in my case I put some pressure on the right persons in FRA and LH and learn that my bag and Passports are found and that the Passports are on the way to the embassy, to my luck I contact the embassy before they receive the Passports from the police and avoid the cancellation of the Passports.