For fiscal year 1999 and thereafter, funds transferred to the Office of the Inspector General through forfeiture proceedings or from the Department of Justice Assets Forfeiture Fund or the Department of the Treasury Forfeiture Fund, as a participating agency, as an equitable share from the forfeiture of property in investigations in which the Office of the Inspector General participates, or through the granting of a Petition for Remission or Mitigation, shall be deposited to the credit of this account for law enforcement activities authorized under chapter 4 of title 5, to remain available until expended.