I just skimmed through this thread to see if people were doing this for fun or not... all of the metalish cards (and the Ritz card) I had were sent back to Chase in the little envelope you can ask for. I only saw one mention in this thread that showed people knew about it.
I did like the Ritz card though, that card got me some comments and even a date once. Whenever I travelled internationally i had to bring the plastic version for when I was wandering or in sketchy areas though. Sometimes it was too much attention.