“Liberty 285” is a stock dispatch sound effect that has been used in countless films and television shows.
Where the sound was first used is unclear, but many people attribute it to a shareware game from the 90’s called, “Spiderman Cartoon Maker”.
Screened.com, however, reports that it was first seen on a sound compilation called, “Sound Ideas – Sound Generals Series 6000”, though the first film that it was ever used in has yet to be discovered.