It appears there is still some confusion as to what a beta card is and how people can get them. Unfortunately they are highly sought after by collectors and can be difficult to obtain. The beta cards were distributed during some parts of testing, soft openings, & early in the official launch. As a result of them being discontinued and having a high demand people are starting to counterfeit them.
Here are some characteristics to look for in a beta. First is the obvious larger rounded corners. Another being the color of the image, the beta cards seemed to of used a higher quality ink that made the colors appear darker. Also the card stock they were printed on is a bit thicker and more durable than the cards currently available. Finally if you take a close look at the bottom or top of a newer card you’ll see a little tab where the cards were pulled from the sheet after printing.
Although I have yet to see a fake first hand I’ve heard from others that people are simply hand cutting corners of the new cards trying to pass them off as betas. Considering there are people faking pins & vinyls this shouldn’t come as a shock to anyone. So as always be cautious when trading and if you’re not sure don’t take the risk.