Year of the Rabbit 12 Coin Collector Set (In Wood Chest)

These are extremely rare. They are pressed copper with silver overlay. 3D printing with painted artwork on each token. Each in cased in its own hard shell casing. 12 coins for each of the months. Information is limited to these tokens as I have not been able to find much information online about them. 2 of 5 does make them extremely rare. Also I have not been able to find a year when these were released. So it would be one of these release dates. These are the years of the rabbit: 1915, 1927, 1939, 1951, 1963, 1975, 1987, 1999, 2011, 2023... They are not 2023 for sure, as I have had these for 3 years now. I'm guessing 2011 or 1999. Token 6 top right in the photos looks as if acid was applied. This is a way of testing metals for composition. The other 11 coins are unblemished. If anyone has any information on this please feel free to reach out to me