I have confirmed several facts.
It is true that they were attacked by Dark Iron dwarves and brought the bodies back as proof. They were then sent to investigate the disappearance of Albus Snapthunder.
They did some business around the city, but the details of this are sketchy at best. I believe it is these events that decided the ultimate fate of Olivia Grimm(which you know of, so I will only cover it when the time comes).
They were told about the two covert groups that were attempting to start conflict. I have several more avenues of investigation I want to follow and confirm before compiling that information, however.