Sadly , I've added more lost coins than I'd care to admit. I heard about Bitcoin in 2010 and decided to start mining while at work . Did so for about 3 years till I moved and got about it . Never found the wallet.dat files 6 years later when I went looking. The bitcoin core wallet showed 2,100 encrypted files ( not sure if that is transactions or what) if transactions there's no telling how many coins as my PC would have been clearing 3-4 BTC solo mining in a day