Did you ask for your copy of the document?

But; when I asked if there were copies of Legal documents re: Title, etc the answer was "No" & they removed themselves from the Messenger conversation.. 

It also wouldn't hurt to ask for the "rent roll" or rental history and copies of the leases. 

Of course talking directly to the property owner could be a fine way to verify that he/she freely signed the Purchase and Sale agreement.

The kwikset smartkey is a special lock about $20 per piece ($40 for deadbolt and knob but not sure why you’d need both if you can just change the deadbolt) and you can get a rekey pack with 4 keys of 1 type and 2 keys of another for like $10 (cheaper than making 6 key copies).

You've likely done so as you have a Section 8 tenant, but for anyone who hasn't yet done so, make certain you grab a copy of the Section 8 checklist from the local housing authority to read about the requirements and rules.

Ask for a copy of last correspondence from lender with amount owed.

You would have to have a copy of her mortgage statement so you know all of the numbers.

Did they provide you a copy of the “DENIED” findings?

I would also drop a copy of the notice off at the post office and mail it to the holdover via certified mail.