I live in the state, there's more to this story
This story has been in the news around here for several years. The prize went unclaimed for many months, and the year that you have to cash it was almost done, so there were stories in the news wondering if someone had the jackpot winner lost in the bottom of a purse or if it had been accidentally thrown out.
A few hours before the time expired, an out of state lawyer delivered the winning ticket to the lottery office in the name of a trust in Belize. State law requires that lottery winners be made public, but the lawyer said he couldn't divulge the the person or persons behind the trust and eventually dropped the matter. The state ended up using the prize money to fund some other lottery prizes so it didn't go to "waste".
Obviously dropping a claim to millions of dollars will raise some suspicions, so the state began investigating, but they couldn't learn much. Eventually they released the security tape footage from the convenience store where the mysterious person bought the ticket, asking for the public's help to identify him. Someone figured out who he was, and the rest of the investigation put the pieces together. AFAIK this guy had not been suspected previously, the investigation had focused around the idea that maybe the ticket had been criminally obtained by the bearer and that's why they wanted to hide their identity, or they were trying to avoid paying taxes on the prize.
I know it looks like there's not much evidence from what the story says, but I'm sure considering how long this investigation has been going on, they wouldn't be moving on him unless they were sure they had enough for a conviction.
What this goes to show is that allowing people to claim lottery prizes anonymously is bad policy - he would be living it up in Belize if they did that here. Also that the state lottery's IT oversight was poor - like the NSA they placed too much trust in those with administrative access. But in the end the bad guy never got a cent and will probably go to prison for a long time for his trouble, so the system worked "well enough" even if there is some obvious room for improvement.