Cordelia nodded. It was odd, knowing who this man was - his secret identity and all - yet not being able to discuss it openly. But oddness just so happened to be her specialty, so she didn't really act any different than she would have otherwise. Simply smiled and replied easily enough, "Well, I'm not sure how much we can really help you out. I mean, we have our fair share of theories and a couple of leads, but for the most part it's one big old mystery."
Moving toward the counter, she picked up the file and headed to the file cabinet along the wall. She continued speaking as she worked, although her gaze obviously didn't remained locked solely on Superman.
"I do know that it all started getting really weird last November." Pulling another file out of the same cabinet, she glanced inside, nodded, then closed the drawer and turned back to the newcomer. "See, there was this huge battle between good and evil. And I'm not taking evil humans - although there were some involved - versus cops or anything. I'm talking demons, vampires, there was even a dragon involved. It all happened right here in L.A. and, while the good guys won, the bad guys weren't exactly beaten entirely."
Crossing back to where he stood, she held the file out for him to take. Nodding at it, Cordelia added, "These are some of the newspaper clippings about what took place. Nobody is named directly since the media didn't even catch wind that something was up until the city was engulfed in flames, but Wolfram & Hart were the ones responsible for unleashing literal Hell here, and Angel - the Champion that this place is named after - and a few of his friends who were still left standing were the ones who did the defending."
The file also contained Angel's own personal account of what had taken place - a journal of sorts that he'd begun keeping after it all was said and done. Cordelia had only let a very small handful of people see it before, but she figured if she could trust anyone to possibly put the information to good use, it'd be Superman.
If not... well, then they were all probably pretty well screwed.
"Oh," she added, almost in passing as she turned back to the counter in search of her bottle of water. "He talks about me in there, and the fact that I was dead at the time." Finding the bottle, she took a drink before smiling. "Obviously, I got better."