Ok here you go.
(This is for the Sniper run through)
Zalton
In the ranger station, in the barn where the Duty/Bandit gun deal is going down. There are some pipes on the left wall as you go in through the large double doors, there is a ladder against the far wall, climb up and at the other end of the walkway on the pipe, there are the Basic ones.
The next is the Sawmill, Lots of Zombies, and if you whereas unlucky as me a few Controlers (I once had a pair of Psudiogients there, bitch to kill with only a K98) but there should only be a few of the controllers, In the down run house at the bottom of the hill and there is in the attic on the left extension as you come up the ladder.
Then the last one is in the Iron Forest, after dealing with the zombies and the Poltergeist, maybe a Bure or Controler, in the far corner there is a guard room with some stairs leading down, under the last flight there should be the set.
Pluto
The AA Complex next to the Nerd Fortress. you need the code from the barrack and then head into the bunker under the barracks in the last room in one of the large containers there should be a set.
The next one is in the Ventilation Complex near the railway lines, the place you go in search of Oasis, go in the entrance and turn right. Go in the room and turn left into the room with a fallen bookcase and the bathroom. Turn left and go through the door into an ante chamber. Turn left and take the stairs down into an open space. Turn right to go through a door into a dead end room. There is a fallen bookcase in the upper left corner. The tool set is hidden behind a bookcase
The last set is....well in the "Occupied" end of the Jupiter Plant complex, fight your way to where there a bunch of containers, some silo and a tracked digger, there should be a shed next to the silo and behind the digger, in the gap between the shed and wall.
Hope this helps, if your playing another class you may need to look online