The owner (a former miner) doesn't even need these coins. He splitted a large account (147PsLmcSFhEUEjAerYY6VEH6Z6kCrDwyK) and transferred back in 2017 to three addresses 500 BTC each. Two of them he has access to:
1Ek93YBu22kMJ43GhbTy13dYnckcbZE4xu
1HtQwoguFkvMynK1NyDhh1weHjrMyDAKU
But for the address 1PfNh5fRcE9JKDmicD2Rh3pexGwce1LqyU he lost a part of the private key as you can see on the diary photo. And he agreed to make a challenge, where people can participate to find the WIF.
@prutis is A SCAMER HE TAKES WALLET.DAT FROM WALLET PROVIDERS FOR VERIFY FAKE WALLET OR NOT, CASH OUT WALLET WITH BRUTE FORCE POOL WHAT HE ORGANIZED, AND AFTER NOT PAYY TO WALLET AND COMPUTE POWER PROVIDERS !!!
HE CASH OUT 10000 BTC WALLET.DAT AND OTHER WALLET AND SCAM ALL PEOPLE, NOW HE MAKE ANOTHER CRACK POOL, AND DEFINITELY HE SCAM ALL PEOPLES AGAIN. DONT THRUST @PHRUTIS !!
More info
https://bitcointalksearch.org/topic/m.64216304