Comments on the article indicate many readers don't believe the recovery
even happened.
Given the chain is transparent, I'm surprised the account number wasn't
bandied around. Haven't looked myself, but the answer is at least partly
right there.
Sputnik International: Digital Analyst: FBI Colonial Ransom Recovery 'Mystery'
as Bitcoin Unhackable Without Private Key.
https://sputniknews.com/us/202106101083117738-digital-analyst-fbi-colonial-ransom-recovery-mystery-as-bitcoin-unhackable-without-private-key/
