Unless it's not true earnest money and is money owned regardless of closing or not to be paid to the auction company, payable to the auction company, I would disclose it all on the CD. I vote disclose because they are still holding which blows theory 1 out the door.
I would:
Credit check back, as normal EM would be.
Charges to Auction company [1% commission] paid by buyer
Assuming commission is owed to selling Realtor - paid by whomever the contract says will pay it...likely the buyer since it was auctioned.
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My opinion only. Not legal advice.
Say you'll haunt me - Stone Sour