You're right, in fact the current Harrah's/Caesars cards should be split up based on the company name change when they went from Harrah's to Caesars Entertainment. I'll have to talk to the other CG Admins and see how they might want to handle the split since it involves more than just the slot cards.

Additionally, if you ever wanted to get really serious with Harrah's/Caesars cards I have a large number of different player# prefixes for almost every issue card, including many of the rarer ones. Plus I have different mag stripe sizes/colors, different printings, expiration dates and more. There's still over 18,000 different Harrah's cards in my main collection not counting doubles.