Only if he's dumb enough to cash out.
Blockchain analysis shows the coins were immediately sent through a mixer so the thief could have pretty easily cashed out by now.
Are mixers really useful for large volumes? Have not checked them in quite a while, but when someone with >100btc trying to mix it becomes pretty obvious which output coins are his. So while it might not be a conclusive evidence, once he cashes out and it turns that he used to work at alitin at the time, dots connect and case opens.
That probably depends on how you define "large volumes". I don't think the few hundred
BTC that is the upper bound of what the thief took would be easy to trace, especially if multiple mixers are used.
You would probably need to move four digits worth of coins in a short period in order to potentially have your coins traced with blockchain analysis.