When the United States recovers any asset or assets specifically identified in a valid declaration filed under section
4221 of this title and the Attorney General determines that the asset or assets would not have been recovered if the declaration had not been filed, the declarant shall have the right to share in the recovery in the amount of 20 percent to 30 percent of any recovery up to the first $1,000,000 recovered, 10 percent to 20 percent of the next $4,000,000 recovered, and 5 percent to 10 percent of the next $5,000,000 recovered.