Okla. Stat. tit. 60, § 60-701: Accounts presumed abandoned - Escheat

All Postal Savings System accounts created by the deposits of

persons whose last-known addresses are in this state which have not

been claimed by the persons entitled thereto before May 1, 1971, are

presumed to have been abandoned by their owners and are declared to

escheat and become the property of this state.