Not sure about the full list of originals but there are more updated lists including known "killer samples" that have been discovered for different audio codecs

Not sure about the full list of originals but there are more updated lists including known "killer samples" that have been discovered for different audio codecs in the intervening years in various posts at the Listening tests section of Hydrogen Audio https://hydrogenaud.io/index.php?board=40.0 https://hydrogenaud.io/index.php?board=40.0