The proof that he didn't report it is the fact he isn't taking credit for taking this criminal down. The ego you mention would not let him stand aside and NOT take credit for busting Blago. I bet Bozo is sweating bullets right now wondering what Blago will blab.
That could be true I guess. I hope someone is keeping a close eye on the governor so there won't be a messy suicide or a trip down an elevator shaft.