XF 1.5 Hidden extra smileys?


by default xenForo comes with 12 smileys but I found additional 23 smileys in the sprites image:

Is there any official XML (title, text, ...) to use them?
I can not import the sprites image and if I try to import the smilies folder, the text (replacing text) of all smilies is missing...

That is why I asked for a more official solution.