This youtube clip demonstrates the iphone holder I installed in our Prius. the holder for the iPhone reqired 4 small screws, one of them fell down the vent (see pic) is this something to worry about? I haven't heard any noise or anything. Going to bring it up with Toyota during our next service. Usually when similar things happen i can take a computer and shake it about and the screw falls out but since i'm not the hulk...
If you want, you can pull the vent out to retrieve the screw. This requires that you start by pulling the vent out on the far left, near the driver's door. Then remove the plastic panels above and below the steering column. Finally, you can pull out the vent to the left of the MFD and find the loose screw. To pull the vents out, you exert horizontal pulling force by placing your hands at the top and bottom of the vent housing.