Although E-bay is a very old online retail company, but now a days there are lots of fake products available at ebay. As there is also an option of registering your own product at ebay, some mischief maker register their fake product over ebay and sell them to us.
There is no option to check your product before delivery as this site is not like olx or etc. Also there are some items like mobiles and others which are not designed for Indian market and you could easily end up buying one. So my suggestion would be to avoid ebay so that you do not end up buying a fake product and end up losing your hard earned money.