Online Authentics is more of a registry for private signing items, although they do some third party authentication too. If you punch in your sticker number on their site, it should bring up a picture and whatever information they registered about the item.
Koufax's agent Harlan Werner is one of the principles in OA and I'm pretty sure OA stickers with lookup information are on most of the stuff Koufax has signed in private signings in the past 8-10 years (same with two other Werner clients, Joe Namath and Muhammad Ali). I have a Koufax Steiner 11x14 and there's an OA sticker in addition to the Steiner sticker.
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