Calling Rossi's (1866 239 6643) and hitting any numbers just allows you to leave a message, so I don't think there is a PIN there.... but if you hit *, it asks you to enter the extension you wish to log into. I tried 413, any other ideas?
I think the * just jumps you onto 42E's voicemail system. I do like the idea that the Dent/Notaro convo was recorded by Rossi's, but I'm not sure how to get to it...