I know the feeling! Shaun or one of his efficient assistants can answer this better than I, but in my vast experience (7 months), I’ve found that the books are usually mailed around the 20th of the month or so. That means, I speculate, that they’re packed several days in advance of that. So it’s possible (again, I speculate) that you didn’t make the September batch. The same thing happened to me when I joined in the latter part of March — I had to wait until early May for my first installment (partly because I’m in the US and delivery takes longer). But a thrill postponed is even more thrilling!