43 C.F.R. § 30.243
A closed probate case may be reopened if the decision or order issued in the probate case contains an error of fact or law (including, but not limited to, a missing or improperly included heir or devisee, a found will, or an error in the distribution of property), and the error is discovered more than 30 days after the mailing date of a decision.
[86 FR 72087, Dec. 20, 2021, as amended at 88 FR 39769, June 20, 2023]