eBay was not happy with the auction I had. Here is the mail I got from them:
Your auction listing offered to sell potentially infringing material, "Mod Chips" and/or other devices with the capability of permitting the play of pirated product and/or import games on a domestic system. Such devices bypass a copyright security system in the console. By bypassing this protection system the device is infringing the copyrights of the content owner.
They should be happy to know that I did end up backing out of the deal, since it seemed the item was un-replacable. However, I recently got a new 'Action Replay Plus' that works with the games I tried it with, while my old 'Action Replay Plus' did not.