Crypto and Civil Asset Forfeiture

https://arstechnica.com/tech-policy/2020/11/feds-seize-1-billion-in-bitcoin-from-silk-road-drug-marketplace/

Here, they use the word “seize” but they don’t make any clarification about whether the defendant willingly surrendered his private keys, they only say they “zeroed in on the wallet”

Anybody have any info about this? Did they actually get his key?