Mystery Part

[Lemon Flavored Sherpa]

My wife took our Lexus on a road trip with some friends. One of the friends was taking her things out of the car and pulled out a long part, shaped like an elongated capital D (about 3 feet long) with four plastic knobby hooks on it. She told my wife it fell out of the car but told her she didn't know where from. We can't figure it out either. It doesn't have much of a label to indicate where it came from or how to put it back. I attached a picture. Anyone know what this is or where it goes?

[Lexus Owners Club]

It looks like an additional cover for the trunk area at the end of the upper cover 

[Bob Seery]

It is what the admin said above.  It attaches to the inside part of the liftgate.  It fills the gap between the roll-out cargo cover and the door.  It is a bit fiddly to replace it...  look at the liftgate just below the window and you will 4 attachment points.  As the diagram indicates, you sort of "hook" into the inner two points with the panel angled down, away from the gate.  then you lever the panel up to level with your hands close to the outer attachment points.  Push up there until it snaps into place.  I usually do this standing at the rear bumper facing away from the car,  looking up at the gate.