Governments seized a lot of BTC in the past. As soon as they have physical access to the owner, it is seizable.
Bulgaria seizing 213K BTC: https://www.coininsider.com/bulgarian-government-owns-3-bill...
The US seizing 73K BTC: https://www.bbc.co.uk/news/technology-54833130
are prime examples.
More recently, US getting back some of the ransom paid: https://www.fastcompany.com/90644461/stolen-bitcoin-is-hard-...
In fact, seizing property can have many complications and be very hard(ownership structures, occupant protection laws, debts and obligations etc).