Del. Code tit. 12, § 1114

If any person, at the death of any intestate, shall be indebted to the intestate, or if any part of such estate, real or personal, was not mentioned and included in the Court’s initial escheat order, be in the possession of any person, the same shall be recovered to the use of the State by such action as the case may require, in which proceedings the initial escheat order touching the estate of such intestate shall be admissible evidence to prove that the intestate died without heirs or known kindred.