Just to be clear, this is a major problem:
http://www.irs.gov/uac/Newsroom/IRS-Combats-Identity-Theft-a...
It's called SIRF (Stolen Identity Refund Fraud) and it likely costs billions a year at the federal level (I could not find data on states).
The difference seems to be that Turbo Tax was just the vector because it could be automated. Not a lot of payoff in doing it by hand.