If such proof is not filed within the time limit set out in § 58.1-913, then the clerk of the court shall forthwith notify by mail the official or body of the domiciliary state charged with the administration of the death tax laws thereof with respect to such estate and shall state in such notice so far as is known to him:
The clerk shall attach to such notice a plain copy of the will and codicils of the decedent, if he died testate, or, if he died intestate, a list of his heirs and next of kin, so far as is known to the clerk.
Va. Code § 58.1-914