BrickheadDave

https://imgur.com/a/QhjxL6w

More pictures for those that might be interested.

My conclusion is that it is a knock off as there is no Matoran text on the back between the eyes.  But it looks cool so yay.

I shall try and take a few more photos tomorrow when I get back home.  It doesn't feel like a knock-off, it has the same rubber feel to it and it the right size though my experience of masks is limited to what you see in the photos.

I bought some Bionicle from eBay recently which contained quite a few Bohrok and therefore quite a few Krana.  While trying to work out which Krana came with with sets I found an unusual one.  I split them into 3 groups of Bohrok - Bohrok Va - Bohrok Kal following several guides from online and ended up with this. 

Imgur gallery

Using Bricklink to define colours for the different sets, they are as follows;

Bohrok

• Blue
• Orange
• Red
• Green
• Lime
• Medium Blue

Bohrok Va

• Yellow
• Purple
• Dark Grey
• Tan
• Black
• White

Bohrok Kal

• Flat Dark Gold
• Metal Blue
• Metallic Green
• Pearl Dark Grey
• Copper
• Pearl Very Light Grey

I can't find anywhere that references a light gold krana.  What have I found?