I'm attempting to replace an old Leviton light switch with a new Lutron dimmer switch that connects to our house's Wink system. The old switch had 3 black wires attached to the light switch and no ground wire.
Other reference picture:
Upon further investigation, the box appears to be grounded itself. There is a bare copper wire screwed to the back of the box.
Since it appears the old switch was grounded via the box, can I just ignore the grounding wire on the new switch and let it work the same way?
All the pics are hosted in an album here for easy viewing as well.