Pub. L. 93–495, title VI, § 604, Oct. 28, 1974, 88 Stat. 1526, provided that: “This title [enacting this chapter] shall be applicable to sums payable on money orders, traveler’s checks, and similar written instruments deemed abandoned on or after February 1, 1965, except to the extent that such sums have been paid over to a State prior to January 1, 1974.”