When it is revealed as a result of a resurvey that an area previously occupied as a part of one survey is actually in an adjoining survey, and if the occupied land is state land which has not been sold, the occupant may purchase the land within six months after discovery of the mistake. An affidavit of ownership and chain of title shall be filed, along with a filing fee of $3.00 for each deed filed. A surveyor's sketch and report of survey must be filed. The price at which the land may be purchased will be set by the School Land Board as provided in Texas Civil Statutes, Article 5421c-3, §4.