The kennel may not be big enough. You will have to clean it out at least once a day, including food and water. And they would have to be in it for at least 2 weeks if not four (to be safest).
Honestly, and I hate to be the buzz killer here, if I was you, I would stay FAR away from a chicken auction. There are so, so many reasons why. If you think about it, WHY would someone send a healthy, egg producing hen to an auction? If it was worth anything and healthy, they would sell it locally.
There are usually many sick birds at an acution and they are not treated well while there. The birds are all usually in very close quarters to each other, thus the potential for cross contamination is VERY high.
Respritory issues are usually the ones that go around, so look for ANY signs of illness amoung ALL birds there- cloudy eyes, bubbles around the eyes, liquid of any kind around the nostrils, scratchy breathing noises, labored breathing, bubbly breath sounds and general listlessness of any bird. Look for any kind of leg issues, like raised scales, or tiny mites crawling on the legs (scaley leg mites). Look at the vents- make sure there are no signs of diahrrhea or poo build up, look for poo build up on the feet as well as that is bad and can transmit bateria and just screams of lack of proper care and sanitation.
If you cant see ALL the birds up for sale at the auction to check these things- DO NOT BUY ANYTHING!!!! Some illness can take a long time to show up and can be either deadly or at the very least, take forever to cure and also infect your current flock.
If even ONE bird shows any of the above signs of illness- DO NOT BUY ANYTHING!!! Chances are too high for cross infection. If they wont let you inspect each bird available, even the ones you dont want- DO NOT BUY ANYTHING!!
Sorry for all the caps, and for probably sounding paranoid, but I would HATE for you to think you were getting a wonderful bird for a great price and have it turn out poorly. Auctions well done can be a good thing, but unfortunatley, many, many are not and there are ALOT of posts here on BYC asking what to do for a sick chicken bought at an auction.
Good luck and I hope you have fun and have a positive experience!