I give this guy kudos for entertainment, but this story is completely fabricated.
I've traveled throughout the United States and overseas to investigate purported hauntings, both residential and commercial. With a film crew. Believe me, if this residence was known as a site of a mass murder, it would have been on our radar screen. Every paranormal group worth their salt would know about this.
Every point other reviewers comment on to indicate this story and "documentary" is correct.
But the "Dead Giveaway" to me, was when "John" said that the owner planned to sell his house. If the owner knew of this "story" of a mass murder in his house and didn't disclose that fact up front, it could potentially be a real deal breaker with legal consequences if the buyer finds out, unless he advertises as for sale "AS IS". Some states require the owner to disclose if the properety was the site of a murdew within a certain time frame (usually 3 years), other states have a "don't ask, don't tell" policy. Sometimes the requirement falls on the real estate agent or broker to disclose, and sometimes it's up to the potential buyer to ask the question in order to get knowledge.
Despite these dicey real estate laws for the owner to disclose if a murder took place - the issue of a "haunting" is a whole other issue. If there is a "rumor" that the house is haunted by heresay, that is one thing. If it is publically claimed as "haunted" - this documentary would be the smoking gun in the eyes of the law.
The owner would never allow this footage to be released. It's one thing if you own a historical Inn, and you advertise it as "haunted" to draw public attention and sales. In that case, yes, you invite paranormal groups to "investigate", and make it public.
However, this is a private home in a residential neighborhood. If this house was established as "haunted", the neighborhood house values would drop substantially, and lawsuits would ensue. Think about the house in Amityville, and all the unwanted attention it attracted due to the fllm - and it didn't even matter if the story was true or not. The fact that it was publicaly perceived as "haunted" because of the film sealed it's fate forever.
The other "Dead Giveaway" is that it is illegal to start digging holes on someone's property without their consent, especially considerinng that the guy found a heavy, metal Safe buried on the owner's land! And the film-maker discloses he did not consent with the owner. Moreover, the guy takes this safe home (stolen property) and discovers human teeth! Now, this film-maker not only documented his theft of the Safe, but it can legally be concluded he disrupted a crime scene. He didn't report his findings to the authorities, or to the owner. All this guy said was that he "needed to call his lawyer". ---> No lawyer would advise their client to release this footage as it is evidence of stolen property and the human teeth remains could be all a court would need to get a warrant for this guy's arrest and assess if he was part of a cover-up for a crime scene.
If you are an authentic paranormal investigator of purported "haunted" properties - whether intended to be private or publicized - you would know it's in everybody's best intest to sign a bunch of legal documents that protects you, and protects the owner.