If an Anon can vet this I think I might have found where Joe Pientka has been hiding out. I came across his Grandfathers obituary at which was loaded with names of friends and family.

https://www.legacy.com/obituaries/progress-index/obituary.aspx?n=joe-pientka&pid=189326353&fhid=7047

Tried multiple search engines for Joe Pientka but couldn't find what I was looking for. Then I used Yandex and it popped up a Joe Pientka facebook link.

https://www.facebook.com/joe.pientka

Pretty bare profile but two of the friends stood out. Catherine Pientka and Mary Sisk. Joe Pientka has a Grandmother Catherine who died in 2013 per his grandfathers obit. The Catherine Pientka on Joe's FB profile last posted in 2013. Mary Sisk was also mentioned in Joe's grandfathers obit as providing years of daily care for Joe's grandparents. Makes me believe this could be the FB profile of the mysterious FBI agent. The FB profile says he moved to Scottsdale, AZ so I did a quick search and found this link:

https://www.xlek.com/find/joe-pientka.15433400.html

Seems way to go to be true so this could all be a smoke screen.