Part 1 - Main Offices. The first spawn is behind the desk next to the door. The second spawn is on the knocked over desk in the middle of the room. The final spawn is leaning against a desk left of the Brew perk machine
Part 2 - Morgue. The first spawn is on one of the capsules with people. The second spawn is in the little office sitting on the chair. The final spawn is on a long metal table.
Part 3 - First you will need to turn on all 4 defcon switches which are in the War Room and the Server Room. You should now be able to teleport to the Panic Room then go to the rising wall and pick up the part.
Craft - You can craft this in either the Weapon Testing or the Central Filing.
Pack - Go to the teleporter that took you to the Panic Room and place the teleporter there. Now if all the switches are still flipped you will now be able to teleport to pack-a-punch.