The E63 wagon's scarcity is central to its appeal, and owners have built registries around it. The most-repeated figure is roughly 209 W212 E63 wagons for the RWD 2012-2013 run, with one commenter citing 150 for 2012 and 59 for 2013 in North America, and about 783 total for the 2014-2016 facelift S212 wagons.
Wagon rarity and production numbers
Mercedes-Benz E63 AMG (W212) · history