In my experiences owls don't pluck the birds but take the heads. I have had birds killed by owls and the whole bodies are there except the heads. A fox may leave a good pile of feathers or very little. Here lately I have been seeing fox. I know there has been a female and not long ago a couple...
Most of my cameras are identical to this one and they take very good night pictures. They are manufactured under different names. I do use my cameras in the video mode. I have a converter on my computer to convert the video into images...
So sorry for your loss. Owls mostly take the heads from my experience. Probably the fox especially since you said there was a trail of feathers. I have several game cameras up on my property and most nights when the predators roam here I see one on at least one of the cameras, mostly fox or...