“Because of tungsten’s high melting point, it is not commercially feasible to cast tungsten ingots.”
Leaving aside the Ft Know theory, it is indeed commercially feasible to cast tungsten ingots if they can be passed off as gold. This outfit offers tungsten ingot for sale: http://www.americanelements.com/wmi.html. With today’s high gold prices, jewelers are even manufacturing tungsten jewelry.
I believe the jewelry is tungsten carbide—incidentally, the same thing used to make cutter inserts in some oilfield drill bits.