The provisions of Sections 2100 and 2101, 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, 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 If and when such unemployment trust fund ceases to exist, or such separate book account is no longer maintained, all moneys, properties, or securities therein, belonging to this State, shall be transferred to the State Treasurer as ex-officio custodian thereof, who shall hold, invest, transfer, sell, deposit, and release such moneys, properties or securities in a manner approved by the Director in accordance with the provisions of this Act; provided that such money shall be invested in the bonds or other interest bearing obligations of the United States of America and of the State of Illinois; and provided, further, that such investment shall at all times be so made that all the assets shall always be readily convertible into cash when needed for the payment of benefits. The Treasurer shall dispose of such securities or other properties only upon the direction of the Director.