They took the case all the way to judgment and Writ of Possession (ie Sheriff at the door).Took lots of time and that allowed them to create $9500 of damages.Make the seller deal with it, and perform another walk-thru as soon as they are out. 

In an event such as you just experienced, I would report failed payments until I have regained possession of the apartment and had it relet.Speaking of possession, if you have not so done, check the tenancy laws in Maine to see if you need to go through the eviction process to regain possession of the unit (which technically still belongs to your tenants who are merely just "late" at this point).

Once they have all of their possessions out of the home then I will sign closing papers and change the locks.

Cheryl,Indiana law  specifically provides that tenants have any and all rights, quiet and enjoyment and otherwise, until the date so ordered by the court as part of eviction proceeding whereby the tenants are to vacate the premises and return possession of landlord. 

I am sorry to say but if you believe in either party you do not possess the ability to think for yourself.I believe African-Americans and other underprivileged minorities will rise up in my lifetime and so "no thank you" to government social services.

My eviction attorney routinely gets a money judgment along with the judgment for possession, he does it all at the same time. 

This Holding Deposit will be applied to the non-refundable and security deposit when Applicant takes possession of the above-described unit.

The landlord then documents their finding of the abandoned apartment, including evidence of the tenant's abandonment, such as no rent for the last month and no possessions left behind.

Despite the lease, does she at some point get tenants' rights (I'm thinking something akin to "adverse possession.") or do I have to option to consider her a trespasser if I choose?

You are about to turn over possession of your property.