But since she keeps tuning off the AC, even after me telling her otherwise I feel like waiting for her lease to end might do more harm to the house with high level of humidity.

If they are reputable, this could be harmful to their business and should make it right. 

It harms American citizens and puts law-abiding small businesses at a disadvantage.

It was discussed in one of the lender earning call but I still can't get the substance how they able to change the books. 

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

Tenant shall not allow any sweepings, rubbish, sand, rags, ashes, bones, grease, or other substances to be thrown or deposited therein.

utm_source=GMB&am...it was full of 200k 300k and more k cars   I was a real estate investor so I thought what is  the harm in dreaming?  

Gross negligence does not refer to acts undertaken with intent to harm another, but acts for which the perpetrator knew, or should have known, would result in injury or damages to another person.

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

I know you don't want them using the box, but there's really no harm to you and it's only until a new tenant is placed, then USPS will change the locks.However, you could let the post office know the unit is vacant and ask them to stop delivery to that address until a new tenant is placed.