You don’t mention which hog it is that’s going in the other box. Is it the nursing one? And was the other hog in residence when one went in the other box? Couldn’t blame the mother for taking a quick nap away from the little ones now and then! Hopefully you’ll get more information from the video, but just bear in mind that there is still a gap in time in between videos, during which a hog can easily go into or out of a hog house. Nothing beats actually watching them in real time to see what’s really going on.