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.
The network can be faked and you can change locations, some block explorer only includes ip when transactions. There are many ways you can do to avoid detection, it could be by dividing into several addresses. If you know someone deepweb you can trade with them. This will not be difficult if you understand network security techniques.