Time to put a camera on your camera, if there is a place to hide it.
We had 5 cards stolen from one feeder during last deer season. We put up a cam to watch our camera and forgot about it until the card got stolen again last week, the batteries were dead
We also had a camera turned 90 degrees in a picture, then turned back perfectly to where it was for the remaining pictures. It now has a camera on it also.
My thought is that we have hog doggers too.
Sheriff is also a good guy to inform. All that you know for sure is that you have trespassers.
"Man is still a hunter, still a simple searcher after meat..." Robert C. Ruark