I was reading about Cashaa, that was hacked and 336BTC were stolen. But the hacker can't move them right? He will leave footprints. So why should hackers steal them since they can be found? For example if they want to convert them to fiat.
The only way I think you could get by from this felony is to keep them on very long term. So long that it may be forgotten. But still, it may.
I have always said this hackers are not amateurs they know how to make deals into fat accounts, but I never knew they use to have problem after hacking, that's why I will always suggest you don't do unnecessary hodling, so you won't end up gathering your food for them. They are also getting ready for bull run now to cart away peoples account. If there is no solution/control to this hacking cryptocurrency as future currency may not be encouraging.
That hacker will have a high skill to break the security in the exchanges or website so that they can penetrate inside the database. They can steal the information inside the database, including taking the money. Their reason to steal a huge amount of bitcoin is that they want to make a lot of money from bitcoin, especially bitcoin price can increase more than $10k. They will try with many ways to break and steal the money.