Creates a real dilemma .....you now as the rightful owner of the computer are also the rightful owner on everything on it. So from that perspective, the coins belong to you. However that is a lot of money...maybe share half with previous owner. Who knows...you might want to do the right thing and give it all back...which would be a noble thing to do. I once found a wallet containing several hundred dollars, drove a fair way to return said wallet (as I was heading in that direction for a golf tournament). Knocked on woman's door and handed over her wallet. She slammed the door on me, without even saying thank you. That's when you wished you had taken the money. Will I return a lost wallet in future? Yes, always, because it says more about me as a person!