Lots of actual stuff is made (or shipped) from Hong Kong. I don't know enough about the specifics of Lenovo, I'm just saying I've bought and sold hundreds of thousands of dollars of items on eBay, and I've never yet seen a "genuine" name brand on eBay that shipped from Hong Kong that was actually legitimate.

If I had to bet money on it, I would guess that these are the same type of things that you find in Chinese "fake markets" - name brand items that would pass as name brand to anyone who is not very, very familiar with the brand. If it works it doesn't matter in the end, but I've seen some real duds from those types of markets, as well. Maybe they "fell off the truck," but my money is on that they're fakes that are designed to resemble the real thing as closely as they can.