The NZ's are bred to be meat rabbits. It is unlikely the seller is expecting you to keep them as pets. Obviously, I haven't conversed with the person, but he may expect you want them as breeders. Most breeders get eaten too. If he isn't asking questions, personally, I wouldn't worry about it.
On killing rabbits: This seems to go against the grain with reptile people, but frankly, as a farmer and homesteader, I DON'T understand why. It is NOT hard to humanely kill a rabbit! I have done hundreds of them. I use a small four pound sledge hammer from any hardware store, and a sharp knife. Hold bunny firmly on a clean stable surface. The ground covered with an old cloth or paper bag works fine. (I always offer a prayer and thanks. We are taking a life here, after all.) Visualize an X between the rabbit's ears and the eyes. bring the hammer down firmly on that spot. Err on the side of farther back than too far forward. I give it a couple of good blows. The skull will be crushed. Because I am butchering for our table, I cut the head off and hang the carcass briefly to bleed. You can probably skip this step, and go straight to the hungry snake.
SnakeBytes has an episode where Brian and that Australian guy are feeding the big snakes. The rabbits in that particular episode looked freshly killed to me - not particularly stiff yet, and not wet as if they were f/t. Furthermore, all the rabbits had blood around the mouth. I don't think that batch was euthenized with CO2.
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