This video was sent by Drowned in the Internet Detectives Skype group. Drowned claims that this never happened, and that what we see in the video is the result of Tenebris changing the timeline, the main difference being SKM receiving the Libro Lunarus in addition to the gas mask.
Since this video was sent directly over Skype, it contains no description or tags.
We see someone looking at the open briefcase at night. A loud distorted sound is heard. The person opens a compartment within the briefcase revealing the Libro Lunarus covered in chains. Stickynotes are attached to the book. The notes say the following:
"You'll know what to do with this when the time comes."
"DON'T OPEN IT"
The person inspects the book. The video ends as the gas mask falls on top of the book, startling the person filming.