Ummm.. The answer of this question can be YES and can be NO.
There are many online shopping websites that sells millions products… but every time you shop from online shopping websites, just verify the trustfulness of the website and yes, just check who is the seller, seller ratings, fulfilled orders, and most importantly, check user reviews of the product.
If you are buying from famous website and you are thinking that product you are buying will original as site is famous then you can be wrong!! there are many sellers who ships fake products..
So, conclusion is just check all the things before buying anything from these websites..