User blog comment:Gourgeist/Where is Raphael's Archangel Blade?/@comment-108.16.120.27-20130518020733

Sam used the Raphael's Archangel Blade to stab Castiel in the back, literally but due to Castiel having taken in about 30 to 40 million souls before that event it didn't work. Cas pulled it out of his back and it clattered to the ground at the end of Sixth Season, at the start of the Seventh it was probably gathered by either Dean or Bobby when they left the building so its probably either in the Impala or in the Men-of-Letters stronghold