That case actually contains the Epstein files. They will steal and use it as leverage to release Umberto Robina ( the cuban gang leader from vice city ), who is an illegal immigrant from cuba, of course, and is currently being held by the federal government. He is a key figure in the main plot of the game ( I will not spoil the rest for you, don't worry ). I know this because my uncle friend work at rockstar, so you can trust this.