Law enforcement agency says about 2,400 newly discovered records are being transferred to archives for declassification.
The right-wing incumbent is set to face his left-leaning rival, Luisa Gonzalez, in a second round of voting in April.
The US Navy described its patrol as a 'routine' exercise through the international waterway.
American-Lebanese Hadi Matar, 23, is accused of attempting to kill The Satanic Verses author in frenzied 2022 attack.