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.
Easy Money...Money is very temptation and many people has a great desire and greedy to have such wealth or huge amount of money. And to achieve that goal they are going to do such evil deeds. They have a lot of ways to hide and use what they stole. They can send it first to different exchanges and exchange with other coins before cashing out into a fiat money. But all that ways are just temporary because no one can hide from the authority forever.