No, this was not in a location you would see during normal end-user operation of the car given that most users will never do much more than wash the car and ref

No, this was not in a location you would see during normal end-user operation of the car given that most users will never do much more than wash the car and refill fluids. Neither is it expected behavior by an official dealership to install undisclosed components. Especially when the salesperson will (in my experience) do a pretty thorough tour of the car, under the hood, obscure storage compartments etc, and the aftermarket component in this post would not have been in a locations reviewed as part of that. If this was a desktop computer I certainly would expect even a moderately knowledgeable user to open a computer direct for the manufacturer or retailer before using it to see if there were unauthorized components present.