Out of luck. Received an email back:

Sorry, the craigslist email address you tried to contact (gigs-kzctg-2478099346@craigslist.org) belongs to an ad that is no longer active on the site.

Perhaps the address works for you because it's stuck in your cache? Maybe hitting refresh would show it's actually gone? If you come across it again - or something similar, let me know.

Thanks!