15th Anniversary Kids Special?

Would anyone know more about this folder? The auction text says Mewtwo and 1 or 2 BW3 booster packs are included in the folder, and 1000 folders were made. Which Mewtwo card is included? How were the folders distributed? Why do people bid >5000 Yen for such an item?

doesnt look like a mewtwo card is it it.doing more searches it was a 15 card set promo having a logo saying something and the cards were from bw2 mostly