A Matty box is still legal as long as it is not used in competition.
I've personally spoken to at least a dozen people who knew "exactly" what Matty and company were up to, and what a Matty Box really did. I've gotten at least 12 different stories too.
I also find it interesting that so many people knew what was going on and didn't tell a soul. If someone was stealing money out of my pocket I'd damn sure been squawking loud and hard.
I've also heard that Bader covered for them as until Matty got in dutch at the 5 day.
In reality there was less hard evidence against the Dirty Dozen than there was against Wayne County, but that's another dead horse issue.
You can make a RacePak do way more things than a Matty if you're good, and hide it right in plain sight.