Whole things sounds a bit odd to me. Next time my ex-wife tried to speak to me about committing federal crimes I would say I don't want to talk about this. Of course, if you want to report it that's your right but I would advise staying out of it. This happens everyday and is a big part of the reason the process is so difficult for some who have honest intentions, but I just don't see how any good could come from you being involved in it in anyway.