Just got this back. Hopefully helps a few of us out
Dear Mr. Taylor,
Thank you very much for your inquiry.
The entrance tickets for some football matches have indeed include a VRR-ticket for one trip to the stadium and back within the whole VRR-area (from Dusseldorf to Dortmund and back for example).
These entrance tickets are special signed, for example with a printed VRR-logo on it. But you can use the tickets only on the day of the event/football match. You can travel back to Dusseldorf with these tickets until 3 a.m. the following day.
The last train to Dusseldorf on Dec 5th is S-Bahn-Line "S1" from Dortmund Hbf to Solingen Hbf (23.53 from track No. 7,arrival in Dusseldorf at 01.23 a.m.)
If you stay in Dortmund for the night and travel back on the next day to dusseldorf, you'll need new regular tickets with price level D.
If you have any further questions, please do not hesitate to contact us.