When a member of the panel (from the wrong party... well, that explains everything) has to file a lawsuit to get the reports, something fishy is going on...
Voter fraud has never been a genuine problem in this country.
It may have won Illinois for Kennedy, and hence the election. There is good evidence that Joseph Kennedy used his connections to bring in a sizable graveyard vote for his son, especially in Chicago. But there were very likely equal shenanigans on both sides in all elections, it's only the winner that is looked at.