First, the Staatsanwaltschaft (prosecution authority) should be contacted. As I don`t the criminal record, the height of the penalty cam`t be predicted, so the layer has to inspect the files to be on a par with the authority.
If the person didn`t know if the ticket was to be used, there will be no consecution. The prosecution authority will have big problems to prove any participation.
The person can try to ask the ticket back but it might be better to get a new one to avoid suspicion by the transport authority. The ticket was expired anyway.
With kind regards