In September 2018 Ebay seller brisbanite05 from Inala in Queensland, Australia was trying to sell these three mint sample plates from Lithuania, Estonia and Greece although he says they are used. They look good and are direct from the factory in Germany through a very crooked dealer in Germany (FL) to collectors some year ago.
The Lithuania has an impossible registration as the area code is the C and there was no area code C. The Estonia is one of a batch that FL still has some of and although a possible registration, it has never been near Estonia. The Greek plate is in the same situation, possible but never been near Greece. Those last two are tricky. Fake or not? Whatever, it matters little as they are correct in every way but that LT plate is wrong and fake!
Remember, most plates that are genuine and official from Europe are never mint. You MUST check everything carefully or you will end up with shiny scrap in your collection. If you join the big European plate society (Europlate) you will have access to all the information you need to understand if a plate is genuine. Between that and e.g. the Francoplaque website you should be OK.