It becomes obvious that the goblins have fled, and by estimating the sleeping nooks, versus the number you killed, you feel there is perhaps a dozen left. With some special goblin perhaps. The area labeled 4 was a given over to a shaman or some sort. Phadian and Alrik recognize the signs of wicked idolatry. There was also evidence of herbs and bones and various other resources such that a shaman would use in his/her craft. In the rarest part of that cave is an alter which roughly looks like the small figurine you found before. Clearly some sort of Aerial spirit perhaps? What ever it is the goblins seems devoted to it.
Map Notes:
#3 was the lair of the Ogre you slew. #1 was the original cave you fought the first battle in and #2 is the central cave you killed the gnolls in.