The eBay note looks pretty real to me based on the published image. You can certainly see three clear vertical fold lines. However, it could conceivably be a high quality photocopy that has been folded along the same fold lines as in the original note in order to make it look more authentic. On the other hand, it could be an image that has been "borrowed" from an online source, etc. The Chinese source is most certainly a red flag!
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" Buy the very best notes that you can afford and keep them for at least 10 years. " (Richard D. Lockwood, private communication, 1978).