Those who had been through Cordor lately may have noticed a painting up in Cordor Square, depicting a dead seagull and asking for information as to who's killing them and why.
((Previous versions of the sign looked like this.))
Over time, as people explained the situation to Grimm, the wording on the painting was changed to reflect his new understanding of the situation and now the final version has been completed, this time with a request to the general populace of Amia.
Tacked onto the painting also is a slip of parchment detailing how to get in contact with Grimm, either via messenger hawk or leaving notices for him at his "place of residence" in Uhm (ie leaving a note with the local barkeep, since Grimm lives in a tent). Grimm occasionally can also be found wandering about Cordor, and this is also mentioned in the letter.
OOC Additional, Slightly Irrelevant Info: The painting is a top-quality painting - meaning it's essentially a masterpiece about a dead seagull. Every time I'm around I tend to place it in Cordor, so if you see it I may be online at the time.