[Elecraft] Masking tape K2?

[Erik Linder]

Hi, I'm building K2 #4904 as a follow-up to my K1.

My manual says (at page 29) "Some holes in the front panel was masked..."

I have no mask-tape over the holes, and there has never been any tape 
over the holes. It's painted grey on both sides.

What is the purpose of masking?
1) Just a manufacturing thing?
2) To get un-painted metal for better grounding of the box?

How do I move on from here?

Best 73 de SM0RVV
K1 #1978
K2 #4904 (1/4-built)