The reason FOWL’s HQ is in the library of Alexandria is because in the story “the guardians of the lost library” it is revealed that the books of the lose library were through a series of circumstances turned into the Junior Woodchuck Guidebook

Here is the story by the way:

Cleopatra formed a guard to protect the books

The guard translated the books to medieval Greek moved them to Instabul and added the knowledge of the Muslim world

After the fourth crusade the Venetians got it and Marco Polo added the wisdom of China and Mongolia

It was then given to Christopher Columbus to guard them but he took them adding the knowledge of Pre-Colombian America

The books were confiscated by the Spanish Empire

They were taken by Francis Drake who moved them to Fort Duckburg

Then Cornelius coot found them his son used the book to found the Junior Woodchucks adding ALL modern knowledge

THAT is the reason that FOWL has the library cause Bradford’s plan relies in the Junior Woodchucks