Sheet of gold in cell phone

Yes, I did search on the forum for this, and I never found a thread discussing this. I recently gutted an old cell phone (Samsung Juke to be exact) and behind the keypad, there was a gold colored sheet behind the button receptors. I don't know if it is gold or something else, but what do y'all do with these. If there is any value, what do you sell them as? I would guess it would be the same for keyboard silver plastic stuff. See pics.