1. Insufficient inventory: if the checkerboard products are sold out in official website, they will not be displayed in official website. You can wait until the goods are available, or contact customer service to ask when the goods are available, so that customer service can remind you.

2. Production stopped: If the checkerboard product has been stopped, official website may not display the product.

3. Not officially released: If the checkerboard product has not been released in official website, you may not be able to find it in official website. You can wait for official website to release the product, or contact customer service to ask when it will be released.

The above are the possible reasons. If you have any other questions, please feel free to ask me.