6 months ago discovered the chapter "lost/damaged wallets/passwords/keys" in the Bitcoin world. Since then looking for stories, wallets, transactions that are connected with such addresses. So found also this address. But so far no clues whether it's a recovered wallet. I must say there are so many fantastic stories (but also lot of fake wallets, damaged keys). I hope that people who lost their keys can be able to get their coins one day.

One of the best stories is a guy who created lots of addresses, printed the screen output for each wallet on paper and stored them years ago. Then transferred over a long period BTC from exchanges to these addresses (The sum is huge). But he thought that a message plus the signature of this message can be used as private key and all of his prints on paper show exactly this. Instead of printing the WIFs, he made a cold wallet storage on paper of the signatures as he never saw a WIF private key before and thought that these are used to create signatures with the Bitcoin GUI. The good part of the story is: one day he will be able to calculate the private keys as each print shows several windows where also the txt window is visible with parts of the WIF. What I want to say: 'Your Keys, Your Coins' but understand exactly what private keys are, how they work and test it with small amounts (to an address and from that address to a new address) before you do it with large ones.

Maybe this 5000 BTC account was such a case, the owner was able to 'reconstruct' or 'calculate' his lost/destroyed private key.