The yellow ribbon you are referring to is the copper antenna. Copper corrodes rather quickly in the air if it is untreated. This is why the Statue of Liberty is now green and why old electrical wire isn't shiny gold color. Maybe they are spraying a sealant on the copper now, or maybe in a month or so it will look as dull as you are used to. Anyway, I just took the cover off my launch day Pre and it looks pretty much like your pics. As far as the black board, mine has a black "sticker" over the board. Probably just to protect it from static charge that may occur when you touch it to change the battery.

All in all, if it works, then who cares what is behind door #1!