Ohhh be very VERY careful you never know what you will get at a auction or what will be brought along with it, be very careful!!
I have a hard time now buying adult birds, maybe see if there are chicks or eggs, those would be less of a chance of bringing home anything sick bug infested etc.
Good luck its lots of fun and not all birds taken to auctions are bad, just remember there is a reason why they are being taken there. But its not always bad, I recently took some chicks to auction just because they were from my own birds and I didn't want to brood them because I was not planning on keeping them, someone ordered and didn't follow through, and because I had shipped eggs to hatch and go into the brooder. I also took a frizzle cochin roo because no one else would respond to my ads for him for sale. he was a gorgeous bird. But nothing wrong with any of them, best of luck!