As David says, there are some really good copies out there. The originals are bakelite, so the smooth texture, lack of bubbles, ripples, surface imperfections will help you tell that they are genuine. Copies have usually been cast from a mold taken from original grips, so they will be slightly oversized. They will lack sharp details such as well defined diamonds in the checkering and crisp, sharp edges everywhere. Originals each have a threaded hole where the grip screw is meant to be kept so you don't lose it. The holes should be sharp, with really fine, crisp threads. If the seller will allow it, you can heat a pin and stick it into the back surface of the grip. Bakelite will smoke and let off a distintive smell. Plastic will bubble and curl away from the heated pin.
These are some of the indications.
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