I think the finish is just a protective coating, it comes right off. The caps on my race engine i had to cut down the hump for the main girdle, drill and tap for my oiling system, and when i cleaned them up it came right off so I'm thinking the finish really isn't that important. Maybe they got lazy or either they gave you a set right off the line before they sent them to finishing. I don't know about the cost thing, id bet that all there other caps are probably still getting the finish.