That is a trim cover with noise-deadening material on it. Mainly it just neatens up the appearance under the dash. If you had stopped in at the dealership I used to work at, a service writer would typically run out, pop it back in place, and send you on your way. These are usually held on with little plastic tabs, and the plate is just bent to insert them into slots to hold it in place.
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Tuesday, August 29th, 2017 AT 6:25 PM