I realize that shipping to New Zealand must be very expensive. On the other hand, I once fought with a print frame that invariably put an oval blotch in the sky. The glass appeared to be clear, but the blotch occurred with every negative and always in the same spot. I shone a light through the glass onto a white card and there was this defect, bigger than a sesame seed. It was invisible to the eye but refracted light from within the glass. Chemically glass is a liquid and has a random molecular structure. My glass was non random in this one site and ruined every print.
Moral: Test your print frame and don't accept any merchandise that is sub-standard. If you send it back to the retailer now you can expect satisfaction, but if you wait, you will have to cobble something together that is less than what you bought.