The kobolds have nothing of value, except coin -- altogether 27 GP, 14 SP, 12 CP. Their weapons (one with a heavy pick, the others just javelins and clubs) are quite ordinary, and their leather armour nothing spectacular. I'll assume you take the coins; are you interested in any of the other stuff?
After collecting whatever you have collected, you look around, and see nobody. The kobolds who fled, all went around to the other side of the rubble (the same direction from which they had come).