Those pieces are the stock nylon timing gear. As long as the oil pickup screen wasnt completely covered and the bypass opened you should be ok. Dont drive any more till you pull the front cover and inspect the oil pump first. If pieces went through the oil pump it will be very obvious from the scoring. If not then you will be able to just replace the chain/gear. If you want to verify that its the gear remove the cam sensor and use a boroscope to look at the gear.