Because its clearly just a joke made by the Penny arcade guys.
So?
In FO1, you could find a Stealth Boy in themiddle of a single gigantic dinosaur footprint.
In FO2, you could find a crashed Trek-ish shuttle, surrounded by dead guys in trek-style uniforms ... with red shirts.
It makes no sense from the vault behavioral experiment point of view. How exactly does that help prepare for post world colonisation?
THE VAULTS WERE NEVER MEANT TO PREPARE ANYONE FOR POST-HOLOCAUST SURVIVAL.
That part, Penny Arcade most assuredly did not make up.
Not looking at the Penny Arcade strips - how does Vault 29 (noone older than fifteen was allowed inside) make sense? How does a co-ed "Lord of the Flies" scenario prepare those kids, or THEIR kids, for recolonising the world?
How does purposefully arranging for Vault 12's door to NOT SHUT, exposing everyone to supposedly-lethal levels of radiation, prepare them for post-holocaust colonisation?
Or, Vault 68 ... 999 men, 1 woman. How does THAT prepare anyone to re-colonise the wastes?
How about Vault 70 - populated exclusively by prudish Mormons, and allthe clothing-manufacture equipment would fail within six months. How does THAT prepare them to recolonise the wastes?
Or Vault 42 ... all the lightbulbs were 40 watts, and dimmer. What purpose does THAT serve??
...
The Vaults were
experiments, and their purpose was to explore human nature and psychology.
Vault 29: what happens when a bunch of kids and young teenagers are left to fend for themselves - knowing that the world has been destroyed, and everyone they knew is dead ... everyTHING they knew is destroyed ...
and noone is going to come rescue them ...?
Vault 12: how do people deal with knowing they are going to all die a slow, unpleasant death, affect their day to day behavior in the meantime? (The joke being on Vault-tec, of course, since everyone went POOF into Ghouls, instead).
Vault 68 (and vault 69, incidentally): what happens when a population has an unsustainable gender imbalance. In this case, with only one female, able to bear children.
Vault 70: what happens to a devoutly religious population, when circumstances conspire to offend their religion's sense of morality and propriety? Can they adapt, or do they self-destruct?
Vault 42: how well could people adapt to living in a dim, darkened world - without the benefit of "bright, cheery lights" ...? How rampant does fear of the dark become ... or do they become afraid of bright light, instead?