Sorry for not being clear, but what I meant is the order number system Nuheara uses doesn't provide a continual sequential order number system worldwide, rather it appears that they are using an order number system which assigns the order dependents on one's country , for example SHP-AU-xxxx. This this makes it really hard (impossible?) to gauge how orders are actually going.
I have had a think about it and I would say that they have done this make it more efficient to ship the Boost out as I remember reading somewhere that they had four warehouses (distribution centres) around the world.
I had another three friends buy some Boost yesterday who also hold Nuheara

I told them to take a photo of their screen once the order number appeared.
Order numbers are definitely sequential.