After talking with Allustan again, he informed us that there was indeed a recently uncovered cairn. And he regrets to inform us that a local adventuring group has already went out and searched the cairn..
After getting this news we decide to head out right away to see if there is any information in this cairn, that suddenly appeared, that would help us put an end to this Ebon Triad.
We found evidence of activity at an abandon mining headquarters. This was close to the Whispering Cairn we were investigating.
After a couple hours in the cairn, we began to realize that a local adventuring group that had been here before us searched this place and cleaned it out pretty well.