The provisions of Sections 71-5-451 through 71-5-459, to the extent that they relate to the unemployment trust fund, shall be operative only so long as such unemployment trust fund continues to exist and so long as the Secretary of the Treasury of the United States of America continues to maintain for this state a separate book account of all funds deposited therein by this state for benefit purposes and of money credited pursuant to Section 903 of the Social Security Act, as amended, together with this state’s proportionate share of the earnings of such unemployment trust fund, from which no other state is permitted to make withdrawals. If and when such unemployment trust fund ceases to exist or such separate book account is no longer maintained, all moneys, properties, or securities therein belonging to the unemployment compensation fund of this state shall be transferred to the treasurer of the unemployment compensation fund, who shall hold, invest, transfer, sell, deposit, and release such moneys, properties, or securities in a manner approved by the commission, in accordance with the provisions of this chapter, provided that such moneys shall be invested in the following readily marketable classes of securities: bonds or other interest bearing obligations of the United States of America, the State of Mississippi, and of any county; consolidated school district, supervisors district road bonds, and municipal bonds of counties, cities, and towns of Mississippi; federal land bank bonds and home owners loan corporation bonds; Yazoo and Mississippi Delta Levee District bonds; Mississippi Levee District bonds; municipal bonds of cities with a population of one hundred thousand (100,000) and over located in the states of Louisiana, Texas, Arkansas, Alabama, Georgia, Florida, and Tennessee; and provided further that such investment shall at all times be so made that all the assets of the fund shall always be readily convertible into cash when needed for the payment of benefits. The treasurer shall dispose of securities or other properties belonging to the unemployment compensation fund only under direction of the commission.