Yeah, if that fact was in court documents he doesn't own that bitcoin anymore. The Israeli or American Federal Agencies own this bitcoin now. I suppose it's possible he didn't share how to access his wallet(s) but that's debatable and unlikely. People usually cough up the information if the threat is great enough.
sounds like he hasn't given it up yet:
Though several thousand US dollars in cash were found on Kadar when his home was raided, the teen refused to disclose the details of his bitcoin wallet, which is believed to contain the bulk of his earnings.
Also if he is paid on BTC back on 2015 I think he must have more than 184 BTC because that time BTC has low value.
2015 through 2017. so that's a pretty wide price range. the kid was also charging as little as $40 per bomb hoax, so that might explain it.
if he can manage to hold onto a couple hundred BTC and get through the prison time, he should be
very rich when he gets out.