Believe it or not, the DOJ and IRS are very separate from other law enforcement bodies (and each other), and while it seems obvious that they're the next step, they probably aren't.

The DOJ only seems to care about money in these situations. As the money Micon made is peanuts to the DOJ, they aren't going to touch him in all likelihood.

IRS is a little more possible, but you would be surprised how many slam dunk IRS cases there are which could have spawned from local criminal cases, but never end up going that way. It's like the IRS has their heads up their asses and don't seem look for things like this. And the local agencies tend to only give a shit about their own little world, and don't feel a need to move it up the chain of justice.

As others have said here, Micon's biggest problem right now is the fact that he fleed the country and continued committing the crime, rather than shutting down and taking the "I didn't realize this was illegal" stance, which could have been successful in the hands of a good attorney.