Wow, great service you're running there, informing the admin about all the accounts you don't buy I see. I'll be telling everyone to stay away.
That account wasn't hacked anymore btw, me and the original owner had come to an agreement that I could keep it. You could've sent a warning about the spam before banning too.
I'm sorry but I'm thinking your story is not credible, sound like you're bipolar, since you wrote: "me and the original owner had come to an agreement that I could keep it." Really not credible! In real life such an Agreement means you surrender to hacker demands usually involving
some bucks (or maybe BTC), so why making the OP and involving Admins & community to have back your account for free if you were willing pay the hacker? Not credible at all. A better excuse would be you claiming to be a bipolar subject and provide medical evidence of it.
Assuming the real RiverBoatBTC is being honest (as in he isn't faking the hack, which would be easy to do), the most likely situation given the evidence is that the account was and still is compromised, and then the Riverboatbtchacked account was also compromised. He then posted here saying he recovered it to avoid the negative feedback (and that post which he deleted, at least the way he said he recovered it, is a lie as theymos pointed out).
The current holder of the account, after getting several of his trolling posts deleted, probably decided it would be better to just post and make money from sig campaigns, instead of trolling and getting banned and it being deleted anyway.
I second BadBear statement.