I don't know what happens to me when I touch a piece from a big set I don't have
I have a white noble ruru, I was told it was a misprint, but not sure, did that appear somewhere?
As I researched on BrickLink, the white Noble Ruru is a misprint. It did not exist in a set but was an official color of the piece.
And according to Flickr, this is the list of misprinted masks: https://www.flickr.com/photos/chocobricks_customs/5330669443