No, the DMV most definitely does not want old license plates returned. Itu2019s simply illegal to display them on a motor vehicle after they are no longer valid (including because your car is now registered out of state). Frame one as a memento, or just tack it up on your wall, if thatu2019s your thing, or put them in the recycling (theyu2019re zinc-plated steel, not dissimilar to aerosol cans)