The most powerful priest on the planet is suffering for God and is possessed by Lucifer and the fallen angels.

I am anxious to take possession but want to confirm he has truly left.

If I arrive on March 1st and find the property vacated (cars gone and it's clear the inside was cleared) am I permitted to change the locks and take possession?

So, you are in the possession of a very nice, desirable floor, one that someone who knows something about quality vintage flooring would likely want someday.

It should describe what your responsibilities are and also the landlord's.2) Possession is 9/10ths. 

I’m not exactly sure how I can claim possession if the sale was void?

-We filed for write of possession which was granted but now the Fulton court system has been down for weeks due to data breach or something.I’m assuming I’m dealing with professional squatters and likely identify fraud, as they are not responding to court ordered documents. 

Tell them you don't do partial months but they'll retain possession until the end of the month if they want to take their time moving.

If the property is empty is you can (and should) take immediate possession and change locks as it saves you from mandatory eviction later if they return.

In PA the requirement for Adverse Possession is 21 years so if you buy at Tax Sale and hold for 21 years in PA, you can then claim Adverse Possession and the statute of limitations for appealing the Tax Sale has expired.