If you are not familiar with MT Gox, it was one of the biggest Bitcoin heist ever executed on the largest exchange.

MT Gox announced in February 2014 approximately 850,000 Bitcoin were stolen. MT Gox private key was believed to be unencrypted and stolen. At the time MT Gox was handling almost 70% of the all Bitcoin transactions. Of that 850,000 Bitcoin, around 750,000 Bitcoin was owned by customers.

It is believed the 2014 hack was related to the previous hack in 2011 when hackers got access to an auditor's computer.

At the time, the Bitcoin was worth about $460,000, at the current price it would be worth $24,085,500,000 or around $31,345,297,500 at Bitcoin's all time high.

A trustee for MT Gox has drafted a proposal to return 140,000 Bitcoin to customers. This comes out to about 18.6% of customer owned Bitcoin returned to the original owners, more than 7 years later. At the time of the hack, Bitcoin was worth around $700. Bitcoin is now trading over $32,000, up 45,714%.

Even if you factor in the fact they will only be receiving ~18.6% of their Bitcoin, they would still be looking at 850% return from their initial token price. While that is a fantastic ROI, they missed out on a much larger ROI with their own money and it has been unavailable to them for 7 years.

The proposal is under review by the Tokyo court system, if approved around 140,000 Bitcoin (~4.5 billion USD) will be distributed to original customers and potentially on the market.