Mohamed2001
HATE NEWSPAPERS
Also, the Vault 3 one in the same quest as the HEPA are literally stashed randomly in a locker.
Actually, lets look at the stuff.
In Vault 3 you're supposed to look for a reverse pulse cleaner. Where is it? In the maintenance wing. Makes sense, doesn't it?
In Vault 22 you're supposed to look for HEPA cartridge filters, which are on 2nd Level - Oxygen Recycling, again, makes sense.
In Vault 11 you look for a differential pressure controller, but this time it's more tricky, as it's in a flooded section of the vault in the lower level. The fact that it's a pressure controller kinda, sorta, in a way could make you think of deep underwater, but only a genius or a very creative person would figure it out I'm afraid.
So it's not quite that random, it has some logic to it, though the last one could be hidden in a better place.
Hmm.. Yeah, makes sense.
And the Vault 34 quest (Caesar needing an autodoc repair I think?) is in the clinic area.