Do a little search for "auction" on this forum. I believe you will find a general consensus that an auction is quite possibly the worst place you can look for a goat. Even if you go to a filthy farm where all of the animals look diseased, at least there, you know what you're looking at and can walk away without making a purchase. People don't send good dairy animals to auction. They send animals with contagious diseases (which may or may not have visible symptoms), or horrible temperaments, or inability to breed, or serious milking problems, or animals that nurse other does, etc., etc., etc. What people send to auction are meat animals. They're meant to go for meat. If you want a meat goat, you might get lucky and find a healthy one at the auction, and you might get luckier and find that it didn't even catch anything while it was at the heavily contaminated auction yard. But if you want the best chance, or even a reasonable chance, of purchasing decent stock, registered or not, get thee to a breeder. Period.