Most of what circulates as a "2008 archive" today came from fans using external recorders connected to their Sirius radios. These are usually 64kbps or 96kbps WAV/MP3s.
The main subreddit is usually a cesspool of complaints about the current show, but the is gold. Users like u/ArtieLangeFan2008 or u/SiriusVault occasionally share Google Drive links to meticulously organized year-by-year folders. howard stern 2008 archive high quality
High-quality recordings from this year include Chevy Chase Most of what circulates as a "2008 archive"