There's a thread about bitcoin history and with just a little bit of research then it will display on google. E,g. Bitcoin history bitcointalk then it will show results and In my opinion, this is also a history since it is a correspondence between the founder himself and sirius. The reason I think this wasn't posted in this forum is because it is a post in twitter made not too long ago so maybe someone haven't found it yet or maybe someone already found it but still busy and haven't got the time to share it in the forum.