Further implying an exoatmospheric origin is the FAA's position that the object does not appear to be a piece of an aircraft. Examination of the object does, however, imply that it was fashioned by some intelligent creature, if not by humans. Has Starbuck's viper returned? Given that the metal is apparently cast iron, perhaps not. Such advanced materials may imply the Russian partner in the recent orbital slam dancing incident...but there are certainly many other candidates as well.
Either way, heads up.