Below is a list of the Recovered Files UNSC Audio Logs and where you can find them in Halo Infinite.
Recovered Files
01 The Plan
Obtained automatically as part of the story on the Warship Gbraakon mission.
02 The Question
Obtained automatically as part of the story after finding the source of the signal during the Foundation mission.
03 The Mission
Obtained automatically as part of the story during the Nexus mission when you receive the objective to power the 3 crucibles.
04 The Weapon
Obtained automatically as part of the story during the Repository mission after a cutscene where you find out the truth about the Weapon.