Let me tell you, Dave is a genius and an absolutely trustworthy person!
I sent him my wallet.dat containing 1000 Darkcoin/Dash in 2014, he could not crack it so I tried from time to time with bruteforcing on GPUs myself but without any success, which was frustrating because it turned out to be quite a fortune in the last years.
Now, after 5 years(!) I got a surprising e-mail from him, that he cracked my wallet, he took the agreed 20 % fee and nothing more, while he could have taken it all - I would not even have suspected him after so much time has passed. Soon after he sent me the passphrase.
Thanks again, Dave I hope you can help a lot of other people too, since this is a win-win business
