If revenge is more important to you than the money, hire a licensed private investigator.
Once a PI finds something (and they will if this guy is doing anything shady), you will anonymously send copies of the findings to every elder and at least 3 local media outlets (with a bogus return address--even better, drive across state lines and mail it from far away).
Pour some sweet tea, sit back and watch. I have done something very similar to this and no one suspected me as the whistleblower. The effects were profound and satisfied my need for revenge. There is no sin at all in revenge, my friend, especially when your target is a powerful hypocrite who always escapes justice. Toppling the dynasty of a sociopathic COBE may be well worth the missing $5,000. Hit him where it hurts: his social life, his marriage and his reputation.
(I'm aware this makes me sound like a sociopath. So what. Vengeance is cathartic and as long as you do nothing illegal, there are excellent ways to satisfy that itch. Good luck.)