The manufacturer does not want it. The buyer does not use it. And the user does not see it. What am I?
It's difficult to say without more context, but it's possible that you could be referring to packaging or packaging materials for a product. These items are often designed and produced by the manufacturer, but are not intended to be used by the buyer or user of the product. Instead, they serve to protect and transport the product from the manufacturer to the buyer. The user of the product does not typically see the packaging, as it is typically discarded after the product is removed from it.