Sean
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.
Good luck.