We've been platinum for several years and multiple cruises now, and for the last year or so, the only thing we received by mail were printed copies of our final cruise documents (3 pages or so) and the punch out luggage labels with the deck numbers only on them to be used when our bags reach the ship. The previous pleather luggage tags (with a window for your name exposed only...quite nice) have stopped.
We have never received luggage stags that reflected our status nor would I see the point. Short of the very top levels suites, I think all luggage is delivered to your suite as fast as they can do it regardless of status. We rarely use the Regent hotel but got no special stickers the last time (two years ago). In fact, the Regent rep at the hotel had no form of luggage deck tags (which weren't received by mail in advance) and wrote our details on a regular piece of paper she stapled to the bag's handle. Needless to say, we were worried that the flimsy tab would get ripped off and the bags would go missing...they didn't. The normal ones you receive by mail look like cardboard, but they are very tough.