Found on Dominating, in case difficulty makes a difference
--Three Ironheads (Heavy Gunner, Bomber, and whatever the sledgehammer guys are called) in the map just outside SGS with the entrance to the Underpassages, behind the fence. Got it pretty early (level 7 or 8, I think?) so it was a doozy of a fight at the time but the loot was amazing
--Dead body found in the map between the compound where Newton is rescued, and the main entrance to Junkyard. Had a few items, think it was gun, leather armor, and a few coins
--A crate in the back (NW corner) of the compound where Newton is hiding
--A fourth crate in the little fenced in area between the GMS entrance and the building where you deliver the package for Jack's quest
--A Rogue Plasma Walker outside Rail Crossing
--Two dead bodies in a toxic cloud, man and woman. Both wearing bio suit and gas mask and carrying low/mid quality weapons.
--Some guy named Dolt Jr. walking around in the screen directly east of Rail Crossing.
--Large fight between Ironheads and Foundry Guards immediately west of the Foundry Train. The Foundry Guards can be killed&looted without turning Foundry hostile so there's a lot of potential loot available here.