Lost carry-on on RJ174 train from Budapest to Berlin. Need advice please.

I was on the RJ174 České Dráhy train from Budapest to Berlin-Charlottenburg on March 15th and I left my carry-on the train. I got off in Prague and called as soon as I realized my suitcase was still on the train and the guy on the phone said he would call and have one of the staff people pull it off at the next stop. I called back a couple hours later to make sure it had gotten pulled off, but he wrote down the wrong seat number so it wasn't pulled off and the guy said it had already crossed into Germany and Deutsche Bahn had it now. I filed a report with Deutsche Bahn 3 weeks ago and they haven't found it yet. I'm sure it was on that train and I really just don't know what to do now.

Does anyone have any advice on what to do? Anything would be much appreciated!