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According to the wiki, there is a Leap Day add-on for those cache types.
[edited to add: Add-ons aren't triggered until the badge is at gem-level. "When achieving the status of a Gem badge you have unlocked the possibility of Addons."]
I stumbled on this link the other day and passing it along to anyone who has questions about the leap day add-on. It's a complete add-on matrix that I hope will answer your question.
This is a comprehensive wiki page that will also show you all the new badges.