badspot can see edit history. this means, if you edited your post, then he can still see the original.
you'll probably be banned. the rule against leaving posts is there for a reason - people won't care. if you had left without a word, you would've been better off. some people probably would have thought, "what happened to that killercop guy?", but besides that, you would not be missed.
i'm not saying this to be an ass, it's completely true. if you had suddenly vanished from the forums, you would've been forgotten within days. creating a post saying you're leaving won't help. now you'll be remembered as the genius that got banned over a leaving post, then tried to cover it up and apologize. if you had just left, hardly anyone would've known, and you would've been able to keep your account just in case you decided to return.
but hey, at least you tried. r.i.p.