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.
Even in the long run it still will be kept under close survillance as it is known to be a stolen fund. How will 336 btc be forgotten even in a long run, the long run might even increase the price of the btc thereby increasing the demand and price..