Right across the street from the "Fallen Cranes" control point there's a building in which the downstairs looks like a bank counter or something. There's a room upstairs with loot boxes and a cell phone. You can't open the door on that, but you can loot the stuff through the wall. I found that in the beta, and then in the early full release, it was the same, only with the added benefit of a Hyena rusher trapped inside of the room....maybe there's a back way in that I couldn't find?