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I am assuming you are in Iowa. But, regardless, you can go to the courthouse in the county where your house is located. Go to the Recorder's office and get a copy of the Deed and a list of all the liens against the house. That should satisfy the lender, being even more official than a note from the seller.
However, it makes me a little worried that he won't sign something. I hope, if you are buying it on contract, that you don't have any surprises in the Deed or who has a claim on that property. Good luck.
I never heard of this. Write to them, or contact them and ask what to do if he is non-cooperative. They may be able to check with their legal counsel and approve this affidavit or statement from the Recorder's office.