Well, I've seen that original post/thread as well but it gives no machine press number and it's the press & die that matter.
I have an e-mail from AA telling me how to read the label on their tin (JSB made) which says press & die are all that matters, their first 2 are the press & best I can work out, by cross referring the tins, what you call the batch is actually the die number.
I'd also contradict the "always 00" bit because it isn't on any of my tins.
edit, I've just e-mailed them to ask.