This could be an interesting story going forth; and a potential problem for Favre.
Facts/comments I find interesting:
Investigators seem to have identified the payments as unusually large for the services contracted. This could cause investigators to dig more deeply into who knew what when. It also becomes more likely that Favre will be questioned or forced to testify, since his organization was the recipient of a large portion of the questioned funds.
Is Favre's agent intertwined with the individuals and organizations more than just for representing Favre? Again, the questions about who knew what when could involve Favre more deeply.
If there is any hint that anyone on Favre's side knew or suspected that he wouldn't likely have to supply some of the contracted services, it could make his life more difficult. In my opinion, Favre has not always demonstrated the highest of standards for what is right, moral or fair; and this could weigh against him as the investigation goes forward.
All it might take is a D.A. wanting to make a name for himself by going after a popular figure for Favre's life to become more difficult. A large segment of the public has enjoyed the college admissions scandals knocking down celebrities who falsified the applications of their kids. People like to see the privileged knocked down a few notches.
It will be interesting to see where this goes, if anywhere.