The order numbers started from 430. The order numbers do not increment by 1. I really don't know how this shopping cart software works, but we are using WooCommerce.
(list of order numbers moved to:
https://bitcointalksearch.org/topic/m.2513488to avoid spamming all these damn order numbers
)
[the following is incorrect - see edit below]
The numbers say that the orders DO in fact increment by 1 (Orders 521 and 522. Orders 530 and 531.), so I think TH mistook how their order numbering worked. It's especially obvious when you consider these are just orders from people contributing to this thread. Obviously all the number in between are orders too. Understandable - No big deal to them, big deal only for us drooling customers.
They appear to have been correct in saying the first order number was 430 at least
[Edit: Actually WooCommerce generates semi-random orders numbers, so TH is right, I'm wrong!]