Brand new 12speed Dura-Ace 50/34 chain set

I bought this for the chainrings to complete a bike build with power cranks which were not available in the correct ring size. The box is for that ring size. Unused never fitted. Left hand crank never been taken out of the box.

Looking at photos there seems to be reflection or dust on it. I can assure you that this item is unused and only been out box to swop the rings over paper the above.