Pennsylvania has a "Right To Know Law", which covers informational requests of govt. agencies. You should find out what is available and request it, although likely it would not include former owner's personal info.
You might consult with your state's DMV or state police about knowingly removing a VIN tag, as it is generally illegal. https://www.law.cornell.edu/uscode/text/18/511
(Or not. Sometimes it's better to ask forgiveness than permission.)