When you say you were able to save the AU and AUF files, was this because they were in Audacity's temporary folder?
If you had never edited this recording then it is recoverable with patience (in 1 GB sections) by following
http://manual.audacityteam.org/o/man/re ... ually.html. The only problem would be that if it was a stereo recording, some blocks of audio that should be in the right may be in the left and vice-versa.
If there are AUF files in there, that suggests you were editing the project along with imported files. The 1.2 Recovery Utility that you use for the "manual recovery" doesn't understand AUF files, and if you were editing, the AU files are no longer ordered in a sequence along the timeline, so can't be usefully recovered.
If you were recording into a project that had imported files, then that new recording crashed, you "might" be able to recover the recording from the latest AU files in the project. Without knowing what you were doing, it's impossible to say.
Gale