To be eligible for copyright protection, a product or “work” must be original. In short, the question is if the creator or author of a work has made any creative choices. If these have not been made, but the design of a product is new, the creator may be able to invoke design patent protection for which other criteria apply.
The question that arises in infringement cases is whether another product (consciously or unconsciously) is derived from a copyright protected work. We can assess this for you. The myth that if there is an x number of no copyright infringement exists, is nonsense.