Ind. Code § 25-6.1-6-4

Sec. 4. No licensee shall sell goods or real estate at auction until the auctioneer or auction company involved has first entered into a written contract with the owner or consignor of such goods or real estate, which contract sets forth the terms and conditions upon which such auctioneer or auction company accepts the goods or real estate for sale. A copy of every written contract shall be retained for a period of two (2) years from the date of the auction.