This is what happened with Ross Ulbricht, right? The FBI seized more than 200K coins from his wallet and later they auctioned all those coins. So my guess is that it is possible for the courts to confiscate the coins.
Possible it is but then it should go with the right jurisdiction. In which everything must be on the law and the law will be fair. And also we are talking about a property in which they are about to get to.you, therefore it is indeed important to have rules regarding to this. But as of today I am not sure if there is a country who have such law.