If I were sending $500,000 somewhere, I'd treat it about as seriously as a nuclear ballistic missile launch. He was lucky this time, but someone that careless will have trouble holding on to that money in the long term.
If I had to guess I would say that he likely has/had a lot of money invested in bitcoin and 800
BTC is not he majority of his holdings.
sure, but that's not exactly an excuse to send 800 BTC without double checking the address. that's beyond careless. very, very luck to have recovered those coins, imo. must have breathed a sigh of relief on that one....