|Black backpack in wreckage|
In-game PDA map location
|Coordinates given by|
|“|| What I owe you is located inside a black backpack within the wrecked construction crane.|
- ''PDA message''
There's an Electro anomaly on the south side of the stash, so it's best to approach from the north. Walk past the cement block with the pipe sticking out of it on the up hill side, then turn around and jump up on the other hunk of cement, being careful not to jump into the anomaly. The backpack is inside the pipe.