In fairness it was all concluded on Combetta's own stupidity. He was the one dumb enough to dump static IP's and his own car in posts that traced all the way back to him. How was a guy like that ever tasked with scrubbing Emails?
I know people should be safe online etc and it takes an arse to dig through your stuff to expose you and be a troll but come on. Unless there's two Paul Combetta's that own the same Pontiac, worked for Platte River and assisted E.T (Whilst kindly dumping their network logs and evidently static IP) and both live and work in Denver then it was him.
That's just that though.
These folks seem to be happy to work on the basis it was Combetta:
https://www.youtube.com/watch?v=amMsn3dfVU4
https://www.youtube.com/watch?v=zQcfjR4vnTQ