Verd can be on any coin even as a loose particle that has been passed on from another and with grading companies they have different tollerances as to what is acceptable.
The main problem is when the verd has got into the metal which in some cases will cause corrosion and damage the surface of a coin.
I was quite surprised to see the coin above ,so have blown the images up from the UIN 5854 that Eric sent me.
Looking at blown up pictures of the coin which was pictured before being slabbed i cant see anything at all ,so feel it has changed since it was graded.