It says this in the article: >As alleged in the supporting affidavit, by reviewing the Bitcoin public ledger, law enforcement was able to track multiple transf

It says this in the article: >As alleged in the supporting affidavit, by reviewing the Bitcoin public ledger, law enforcement was able to track multiple transfers of bitcoin and identify that approximately 63.7 bitcoins, representing the proceeds of the victim’s ransom payment, had been transferred to a specific address That seems to imply that they didn't use a mixer.