I was recently playing on the new firefight map, Installation 04 and i wandered my way into one of the bunkers that have the underground entrance blocked off. When i walked in, 343 Guilty Spark floated from the blocked off portion of the map to the door and stayed there for a while. when i walked up to the glass, it showed up on the screen, "hold X to pick up [picture of Focus Rifle]" I will get some pictures soon. Until then, feel free to speculate or call me a troll or liar or whatever.
Liar!!! lol jk. It would be cool if this really happened. I'll have to check back in for the pics later.