If the IMS to crank chain wore thru the wear pad of the aluminum tensioning paddle shown on the right side in this pic of a 2000 Box engine crank housing, it will make shavings like that until it breaks in half. If you remove the chain tensioner right beside the oil filter you can get a peak at the paddle & Maybe see if it is damaged. The chain & wear pad are on the backside, so it could be excessively worn, & you can't see it thru the hole. When you remove the oil sump plate you will probably see more shavings there.
