When I am getting the Listing paperwork signed, I ask my Seller if they have their survey. If they do, I ask them if anything has been done to the property that would change the survey in any way, thus invalidating the survey. This could be building a pool, moving a fence, having an easment granted on the property, etc... If the Sellers have the survey, and haven't changed anything, then I have them sign the Afidavit. It has to be notarized. The Title company and Lender still have to accept it.