There are numerous RFID readers out there that can plug into the USB port on your computer. Some are really inexpensive while others can run $100 or more. The problem is there have been several different standards for the tags/readers. Inexpensive readers may only be able to detect a specific manufacturer tag, etc. Without more knowledge of what kind of RFID tag is in the chip you might not have the correct reader. Personally, I have a reader from FEIG that can read just about any RFID tag. I got it when I was working for a company that did self check machines for libraries and we were supplying RFID equipment. I've used to check some of the RFID hotel room keys but haven't tried it with any chips since I don't collect chips.

By the way, the human body can easily shield an RFID signal and stacks of RFID tags can be troublesome to read at times so it would be interesting to see what technology the casinos are actually using. When we were doing RFID checkouts for libraries we found that people could hold the book(s) against their body and the reader would not always work. In general RFID is terrible for security but great for inventory, etc.