Wow, he has actually 103 Bitcoin in his wallet. He must be really disappointed with losing his wallet.dat. I wish he gets it soon as possible back but that is nearly impossible.
Actually who is this guy ? Does he has a name ?
I think if PC / computer used is still same, I think there is still a possibility of return, see from the last transaction that is in 2012 has been very long, but he several times have sent bitcoin either to backup address him or his friend. if I have personally identifiable information I may be able to help