The iPad Air 2 I bought was delivered with an US battery charger and US to Australian power adapter almost as big as the charger. When approached, BecexTech claim that the T&C's states "there may be a limited features or small variation on some products" and "AU stock is normally marked as Australian or AU stock on product title", hence you need to realise that the model is the "international" [US] model and that BecexTech "supplied the AU adapter for free since we have to adapt with our market segment, which means AU market in this case".
Further to get a tax invoice was like pulling teeth.

Approximate cost: $614