Have i been scamed???

I placed 6 seperate items on ebay for sale, all with a buy now price totalling AU$1500.00. Someone brought them, I was extatic. Then an email message came through stating the seller is in New Zealand, not Australia where I'm based. When I checked the seller ID it is for someone in the United States. The total price and different locations have me worried. I have sent off the invoice and request for payment and am now waiting for a reply. If this all falls through do I get my fees back? This is my first time ebay selling and so far I'm pretty nervous.

Thanks