Have you ever bought from a Licensed Auctioneer? I'll bet OK and the ATF requires a licensed 01 FFL be present to handle all firearm transfers. This is a public sale, not a private sale between individuals.
The last auction I went to, I had to fill out one 4473 for the background check, and pay a $20 for each of the 3 firearms I won.
They have been in business for generations, so I would say they are licensed and would not do anything to harm their business.
Now I can't remember word for word, but they said one is not buying the firearm from them, but from the owner of the firearm. The auction company doesn't actually own the firearm, so it's a private sell. Sounds like a loop hole, but I won't argue with them. These are estate auctions, sometimes "moving auctions:. Oh if it is a loop hole, don't expect the state of Oklahoma to close it.
I can guarantee you, there was no background checks for the ones I went to.
I do know at a "benefit auction " , the county sheriff bought a brand new shotgun and there was no background checks at that auction.
I was just trying to give my fellow Okies a heads up to some local sales.