His confiscated coins are legally, officially, lost (to him) forever.
The issue is: has he got some secret stash somewhere? Does he still hold the keys to it?
A Coinbase snoop is suggesting he located some coins that may be old Silk Road treasure.
It still remains to be seen if it's like he says - and if Ross manages to lay hands on them.
If I were Ross, I would only attempt that when safely far from the USA.