Mongoose reacted to iraki in Investigating Kobolds
Search very carefully in the caves. You will find evidence (and an egg if I rememeber correctly).
There's a cave somewhere with thorns/bones/whatever these are you need to get to. But! In order for the cave to be accessible you need to step on a square piece of ground in one of the caves lower in the kobold camp. You can continue from there. Maybe that's what you missed.