I do recall having seen a different caution label for a battery-packed game, but I think it was a standard grey one (not shiny), probably from a game where the cart was manufactured by the publisher rather than by Nintendo.  I'd go through my carts, but I'm stocked with stuff to do, so it'll have to wait a while.

I though they were always gold, too, but I just happened to find one of mine, Overlord, that is not silver, but standard grey.  Absolutely not a polished gold label, take a look.





I know it's not silver, but it was news to me, so I thought I'd share.

I had noticed the Overlord cart as well, but not until just a few weeks ago. The cart also has the virgin logo embossed in the plastic at the bottom of the back side as well. A strange one that Overlord, there must be a story behind it. Makes me wonder are there any gold label Overlord carts?