The first missing advert was taking place during Pingu's birthday. The only remnant of it out is the script and a screenshot used in the webpage.
The second missing advert was made to celebrate the 100th anniversary of Sumitomo Life, made by Hot Animation. The commercial was mentioned in the production company's website. The only remnant of it out was the picture of the display model that was posted on deviantART by the people who worked on it.