Fannie Mae released a statement
Which makes it suspect to begin with...
Examples of data sources include, but are not limited to, a multiple listing service, deed records, tax records, realtors, builders, appraisers, appraiser’s files, and other third party sources and vendors. The appraiser must state the specific data source (such as tax records or deed records), and refrain from using broad categories, such as “public records.” Data source(s) must be reliable sources for the area where the subject property is located.
Examples of verification sources include, but are not limited to, the buyer, seller, listing agent, selling agent, and closing documents in certain situations. Regardless of the source(s) used, there must be sufficient data to understand the conditions of sale, existence of financing concessions, physical characteristics of the subject property, and whether it was an arms-length transaction.
It is acceptable to obtain comparable sales data from parties that have a financial interest in either the sale or financing of the subject property; however, the appraiser must verify the data with a party that does not have a financial interest in the subject transaction. For example, if the real estate agent of the subject property has provided comparable sales data, that information must be verified through another disinterested source.
What other "disinterested" source exists except the deed and assessor record? Fannie wants you to find some neighbor? The title Company? Who? Who DOES NOT HAVE A FINANCIAL interest in the transaction? The buyer does. The seller does. The lender does. The agent and broker do. Fannie speaks out of both sides of its mouth. FHA
If the sale cannot be verified by a party to the transaction, the Appraiser may rely on public records or another verifiable impartial source.
MLS records and property site visits alone are not acceptable verification sources.