In Chiliad Mountain State Wilderness near the Fort Zancudo military base you will sometimes come across a random event where you will find a clearing in the desert with some bullet-ridden trucks and dead/dying drug dealers. Further down a hill you will find two more dying drug dealers and a silver case full of cash. This is identical to the scene where Josh Brolin's character finds a case full of money in the movie No Country For Old Men. Note: If you do not get the random event to happen, quick save the game, reload it, and then return to the location again. Repeat this until the random event occurs.