How can we guarantee those patents went from the schools directly into IV ? What if the school first sold it to a non-patent-troll 3rd party, and then that 3rd

How can we guarantee those patents went from the schools directly into IV ? What if the school first sold it to a non-patent-troll 3rd party, and then that 3rd party transferred it to IV? Is there a way to follow the history of a particular patent?