I doubt anybody bothers with counterfeiting small motors. Luxury items, - yes, Ebay is full of fake watches, purses, designer clothes etc.
Cheaper items like motors (also small electronics and all kinds of accessories) - yes, rejects are abundant on Ebay, most sellers do indicate that it is a reject, usually in very-very subtle manner, like "the item might have minor blemishes and/or dust and/or original packaging missing".
Yes, star rating on Ebay is the rating of seller service, not of the actual item.