Good on you for being honest about it, I personally think you have done the right thing.

I think the least they could do would be to give you a credit voucher for at least $100 to be spent on any future order. But knowing what they charge for postage to Aus that may only amount to free post on a pinball rubber kit.

But yeah, its their Fcuk up and they need to acknowledge that and reward you. A lot of others wouldn't have been so honest.