If information disclosed in accordance with this act becomes inaccurate as a result of any action, occurrence, or agreement after the delivery of the required disclosures, the resulting inaccuracy does not constitute a violation of this act. If at the time the disclosures are required to be made, an item of information required to be disclosed under this act is unknown or unavailable to the transferor, the transferor may comply with this act by advising a prospective purchaser of the fact that the information is unknown. The information provided to a prospective purchaser pursuant to this act shall be based upon the best information available and known to the transferor.