If it’s above the limit the price includes it all. It’s also subsidised by ebay so it’s often cheaper than directly sending something.
Well unless anything has changed in the last couple of weeks.
The only worry is that eBay can sometimes ask to destroy the item - refund the buyer and...
All that is common on Shimano parts. They are clear anodised or silver anodised.
You can’t polish anodising but you can polish it off (remove it completely ) by hand or by chemicals.
Scotch pad is an easy way to also remove it without the chance of leaving metal bits stuck on the alloy...
Without inspecting or seeing them it’s hard to say.
But purely by the nature of anodised alloy it cant be either option you’ve said.
Are they clear anodised over a polished or bare base? If so , remove the ano , and polish and get reanodised.