I received my 250Km for my 300E about a month ago and was very surprised to see that it was gold. The 500Km on my 240D is gold. The 250Km on my 240D is silver, actually a beadblasted gray.
I guess since their cars don't last as long now, they figure that they better get the gold to you while they have a chance.
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in