many times he has contacted me to look for it, i found it on 25th july this year. i found the walllet and it got knocked on the floor.
What wallet are you talking about? Do you have a wallet.dat file?
i keep trying to fix it, but reconnecting it to the internet could it prove to miners that we mined on it?
Proving to miners?
Take note that bitcoin isn't like a company you work for and there is no centralized authority you want to prove something to.
If you have really mined bitcoin, you should have a wallet file or private key(s).
If you don't own any private keys or wallet file, you don't have any bitcoin and there's nothing you can do as