| ||For all other Vault Boy bobbleheads that appear in the Fallout series, see Vault-Tec bobblehead.|
The bobblehead is at the topmost tier of the Mass Fusion building, resting on top of a metal statue overlooking the main hall. When you enter the main lobby area, you can whip out a gun with a scope and aim upwards. On top of a statue on the wall, you can see the bobblehead. This may give you a better understanding of where it's located.
You have to go to the 5th floor; once there you'll have to jump onto the back of the couch beside the railing overlooking the lobby. You should see the bobblehead below your feet on top of the metal statue.