Instructions
Examine the box that the card arrives or is packaged in. The authentic R4i box is bright red. Any other color is a sure tip-off that you're dealing with a fake. Look for the Games Engine logo on the box to be sure that it came from the authentic manufacturer.
Watch for version codes on the packaging and on the actual card. As of 2011, Games Engine has only produced one version of the R4i card. If the card you've purchased or are considering has a version code, such as v2.10, it isn't made by Games Engine and is likely a fake.
Check the R4i logo, which is widely duplicated, but often done poorly. In the genuine logo, the "i" is within a circle with a steady and equal amount of space all around the letter. In counterfeits, the "i" sometimes touches the border around the letter or has been stamped sloppily.
Find the website listed on the card packaging. A real R4i card has the actual website for the manufacturer printed on the packaging and on the card. The website, r4i-sdhc.com, has a hyphen between the R4i and the sdhc. Without the proper URL, you can be sure that your card was manufactured by an untrustworthy copycat.
Flip the card over and check for a holographic sticker. The real R4i cards have a holographic sticker that reads "Please Access the Official Web Site TRUTH ENQUIRY." Peel off the sticker and reveal a code, which you can then take to the r4i-sdhc.com website. Click the green "Forgery-proof search" button in the top right-hand corner and enter in your code to see whether or not you have an authentic product.