I believe that if you had carefully read the brief article you link to, you would have had a clear idea and you would not ask that question.
As I understand it, the money never left Coinbase. Coinbase identified that transaction as suspicious, blocked it, and alerted the FBI, who would then confirm that it was fraud. The article doesn't say it exactly like that, but that's how I understand it.
If the "Bitcoins" that were "recovered" never left a centralized entity's ledger, then technically no one "recovered" any Bitcoins. We should know the difference between Bitcoin, and units in a ledger of a centralized entity called "Bitcoin". It's truly not Bitcoin until it is confirmed in your Bitcoin address.