Sorry if this has been asked, I'm new to the forums. But I recently picked up my fallout nv again and was left off in the Sierra Madre. I can't seem to hear about the ciphers, I'm trying to complete as many of the challenges as possible but can't seem to ever do this one. Iv
Got christines mention and Elijah talking about the big MT but not the ciphers. Help?

It probably does not matter, as the Triggers that are not unlocked during the DLC are unlocked during the slide show at the end of it. This challenge's only purpose is to foreshadow two of the upcoming DLCs (OWB and LR).

http://fallout.wikia.com/wiki/Things_to_Come!