In July 2017 Ebay seller aomatori from Temerin, Vojvodina in Serbia was selling these supposedly Danish plates.
He is selling them as a used plates for 100USD each. They are absolutely nothing like any Danish plate is or has ever been and they are probably worth less than 1USD each as novelty items.
The blanks are wrong, the font is wrong and the registration is not a real Danish registration.
Be very careful what you buy and check the websites so that you will very quickly and easily see these are just fake plates.