Blockchain activity: https://blockchair.com/bitcoin/address/bc1q7rhc02dvhmlfu8smy...

I have no idea how this passed Coinbase's KYC limits, there must be much more to the story here. I can't imagine that it was a typical self-serve trade via their web UI, he surely developed some form of OTC relationship with Coinbase to pull off buying this much BTC and successfully withdrawing it.

~$144m of May 2021 BTC turned into ~$221m in December at the time of seizure, if they decide to realize the gains.