The Caspian: On your way to the oil derrick, you will come across a large ship, which is being used to imprison slaves. In front of the ship, there is a small outpost on the road. Climb the catwalk with the yellow railings and collect the note sitting on the crate.
Rasp, I'm at the airport, that corporal didn't bullshit us... My slaves just dug the hangar entrance up, and you must see it! It's chock-full of pre-war shit. The old goat was right on the money, it really does look like the flyboys would just dump all the stuff they didn't need there to avoid going through the proper procedure...
They were fucking wasteful before the War, that's for sure. Anyhow, not a word to anyone. Come night, take all your slaves and cars and quietly, with the lights off, so that not even a demon could notice your assess, get over here! We must get all the best stuff before the others catch wind of us - they'd just start fighting over it and then the Baron would claim it all for himself anyway.
So, we take what we can while we can, hide it, and pretend we know nothing.