First time poster here, though I've lurked since thread #1.
That's what I believe. The images certainly didn't come from a trail camera. Image/Frame 2 of the suspect has been cropped by investigators, but if you adjust and overlay both pictures you can see that the camera has rotated between frames :
Not only does it rotate, the position/perspective changes as well, indicating movement towards the suspect. You can see it more clearly if you match cropping and cancel out the rotation :
Others have put forth the same theory, but my guess would be that Liberty German shot the the video and the second image is cropped because Abigail Williams was coming into frame on the left. I'd wager that German caught, at the least, the initial abduction. I cannot think of any other reason why investigators would not release even a snippet of the actual video beyond these two images.