I've uncovered a plethera of falsities about many various fraternities including my own. I recently got a kick out of hearing that my ritual letters Phi Phi Kappa Alpha mean "Protect Friend King Aurthor".... oh really? I find that there is no harm (other than the person's ignorance) in anyone believing these fun rumors. So i simply smile and shrug. One girl asked me why the 'K' in Pi Kappa Alpha was always bigger than the other letters. I said "Why do ya think?"
As far as the ritual books in the Library of Congress, several are non-existing one being Sigma Chi, and another Being Pi Kappa Alpha. They still have, in the LOC registry, other fraternities' ritual books according to the 1880 Anti-secret society movement (which later was appealed by 1940s court ruling Saimons vs. State of California which negated the requirement of all secret societies to establish written documentation of all ritual) After this point, many government officials with ties to their respective fraternity 'legally stole' their own ritual books under the assumption that it was their own property. Much ritual material still exists in the LOC including documents by Alpha Tau Omega, Kappa Sigma, Delta Kappa Epsilon, Beta Theta Pi, Alpha Omicron Pi, and many others.
All secret societies including fraternities/sororities are still required by law to post anual membership logs which are retained in the LOC and may not be retrieved.