We had a thin plastic Swipte 2 Win $100,000 Cash! contest card listed under the Wild Wild West Casino in Las Vegas, NV but I just discovered there are 2 versions of that card plus a similar Swipe To Win Cash and Prizes card.
The original card only had a serial# and the "Insert Card" text on the reverse. The new found variation adds a line of text on the back that asks to "Please Recycle in Container When Finished"
Here's scans of the original card and the new variation plus the Swipe To Win Cash and Prizes card