Peng is located on the flight deck on Chapter 11. When in the flight room where your ship "used" to be, look between the walkways to notice the gap between Runway 1 and 2 by the shuttle in the Flight Hangar. You should see a very small statue that has a golden appearance. Pick it up with kinesis and you will receive the Peng treasure (and unlock the trophy). It can also be sold for 30,000 credits.