All private sales of real and personal property made by a guardian under Article 4 of this Chapter before June 1, 1985, that, under N.C. Gen. Stat. § 1-339.36, should have been conducted as public sales because an upset bid was submitted, are validated to the same extent as if the guardian had complied with the procedures for a public sale. (1985, c. 654, s. 1(2); 1987, c. 550, s. 9).