The answer depends on if we consider a reefer and a box car as close relatives. Christmas set 6-49621 from the 2009 catalog featured a musical reefer that plays 12 Christmas songs. It was not offered for separate sale.
All the cars and engine in that set were uniquely decorated. The engine and caboose were offered for separate sale but the painting and lettering were different. That set also contained the former K-Line 27"R track, but with Lionel stamped into it rather than K-Line.
