If you mined in the early days and were lucky to get a block, then you probably have 50 or 25 BTC in the wallet.dat file.
2013's block reward is 25BTC actually.
But I highly doubt that he'd solo mined at that time, CPUs or even GPUs are getting behind FPGAs and the first generation of ASICs at that time.
It could be no-account pool mining that rewards their share to the specified worker address or a pool with account feature and his bitcoins is in that pool all along.
@
megamarclar Does your "
15eax" address have a balance when you pasted it in a blockexplorer?
Also, if you happened to do solo mining, there's a slightly
long orphaned chain at that time and hopefully, your node (
v0.8.0) isn't one of those that's relaying that chain and got rewarded from any of those blocks.