Question about Koenig Rotary Wave

I recently purchased this product from another website and received a microwave with a matt black "mirror effect" exterior colour. The photo on the website and on the original cardboard box shows a silver "mirror effect" colour. There is no colour reference either on the website where I bought the product or at Galaxus or Koenig. I saw the microwave on display in a shop and the silver mirror effect colour does exist. So how do I order the right colour when there is no reference for it?