I was also ready to file for adverse Possession.

If you dont pay, you typically get the writ of possession pretty fast.

Also be sure to get that original note if you or your servicing agent are not already in possession of it.

(New PA law requires Ten years if the property is less than a half acre -see the affect of PA house Bill #352 lowering Quiet Title times via Adverse Possession to ten years for some PA residences.)  

If you completely liquidated your account, you sold the ownership of your possessions which is impossible with a house because the title/deed never transferred to anyone.

Would this be worth challenging for adverse possession through the court to identify the note holder?

To the OP, it may not apply in your situation but for anyone reading who has turned a primary residence into a rental property as I did, I have been able to use my former neighbors for things like taking possession of keys.

@Rachel MillerUntil he gives you the keys, you don't have possession.

If you were to work up a draft for each scenario, it wouldn't take me long to shoot back approximate buying power with both scenarios, and now the taxpayer/homebuyer can make an informed choice with all relevant information in their possession. 

I sent a demand for possession to the property address and the owner's address listed on the certificate.