I have to say the Mayor's failure to disclose seven emails is quite significant... only if you compare it to the "Chuco Leaks" scam that only turned up two emails worth reading and they were just mean in a funny way. Otherwise it's pretty much a nothing-burrito.
Should all emails always be turned over? Sure. Does it always happen? Never. I guarantee you that council members current and past have purposely hidden emails from these searches. It seems here that the Mayor did his best to turn them over. In fact, the seven found aren't all that incriminating - it's not as if they were even worth hiding. If anything, they make the mayor look like a guy trying to mediate a problem and come up with a solution. He looks like a statesmen to me.
I could see the public outrage over the emails if they contained some kind of quid pro quo for the mayor to personally gain from. They don't. It's pretty much business men trying to work something out in order to save the taxpayers a few bucks. Are you going to look me in the eye and honestly tell me that's a bad thing?
Any higher authority who looks at this matter is going to agree with my assessment here. The mayor will at most receive a coldly written letter from a state level bureaucrat telling him not do it again and to seek more training on the subject. Life will move on.
However, the ankle-biters will not move on. They will murder what's left of their credibility by screaming at the top of their lungs "The mayor had secret meetings to save the taxpayers money!" The irony is lost on them, but not on the public.
And yes, you're going to scream at me in the comments section that I have no regard for law and order and my attitude is ushering in anarchy. However, I will contend the crimes you've overlooked in the past give you zero ground to stand on when it comes to the morality of local government. I'll put the mayor's seven emails against the Children's Hospital management any day of the week.
If you need me, I'll be over here getting the Texas Rangers' horses fed and watered for their trip to El Paso.