No broker that receives them can release the person's balance. Hope you don't get anything from here. Want to know why?

These wallets are linked to the theft of millions of dollars in cryptocurrencies. This movement is probably carried out by a hacker from North Korea and is being monitored by the FBI.

To clarify: the Bitcoin that is there is still free (as is all Bitcoin), so it can be easily moved between other wallets, etc. The point is that it will always be tracked.

There is the possibility of using privacy tools such as mixers and coinjoins but I don't know if it would be viable for that amount, how much it would cost in fees and how long it would take to do it.

Companies like Chainalysis have made millions by tracking funds like this, on open blockchains like this. They will not stop as long as there is the incentive ($$$), which is mainly provided by governments.

So understand, Bitcoin remains unconfiscable, it continues to belong to whoever has those private keys, but it is now monitored and will hardly be sold back for fiat again.