In the trunk of my 97 ES300 there is a device mounted next to the rear deck speaker which has the following: DO NOT REMOVE, and underneath; C085407. It is cylindrical in shape and mounted in a black plastic holder. It doesn't appear to have any electrical connections that I can see. It also doesn't appear on the parts diagrams for the trunk or the luggage deck as it is called.
What is this thing and what is it for?