Bigfoot Lost.

The previously mentioned claims of an actual Bigfoot carcass (Here) were called out by many, and have now been found to be a hoax. Big surprise there. The alleged claims, of both carcass and DNA, appear to have been forged. At least, that is the official story.
Underground sources suggest that the authenticity of this corpse was legitimate, but do to mass skepticism and the discrediting discovering parties, the claims were dismissed. They were said the be covered up by an organization called the "Brotherhood of Bigfoot Protectors". More on the actuality of a cover-up will be given later, I am sure, but until then, we shall stick to the basic strategy and generation of this hoax.
Most sources are claiming that the frozen carcass of bigfoot, see here, is actually an alteration of the internet-born costume, seen here. It appeasrs that the origin of this costume has not been confirmed, however. According to CNN, the hoax was discovered after an "expedited melting process," Kulls wrote. "A break appeared up near the feet area ... as the team and I began examining this area near the feet, I observed the foot which looked unnatural, reached in and confirmed it was a rubber foot." (1) Later that day, Tom Biscardi informed them that both Matthew Whitton and Ricky Dyer admitted it was a costume.

Sources:
CNN.com
Anonymous
Costume picture from: Thehorrordome.com
Carcass picture from: cryptomundo.com