I've added a page to the illustrated room key catalog for keys from the Sands Regency, Reno. This page is a perfect example of a major reason for producing the illustrated catalog -- while it's a lot of fun showing all of the different key fronts from a particular casino, there can be very subtle front (and back) variations that can be easily overlooked. While the backs are obviously different on these keys, a close examination of the fronts also shows variations. I wouldn't be surprised to find that there are a lot more variations of these keys than currently appear on the page.
Also, the Bally's A.C. page has been updated recently to show two additional keys.
http://www.strikeguide.com/rkg/catalog/rkg.htm
Please take a look at the listings and contact me by email if you have any additions or corrections to the information presented on the pages. Thanks!
Jim