Interesting idea, the trail cams. My nephew uses them, he's a hunter, I'll get his advice.
Someone may have already been inside my house. I've noticed a few odd things; cabinets I never use not closed fully, things I use not put quite where I would leave them. Nothing missing I can think of, but I might not notice.
Or I may just be imagining things. Old people get that way, I'm told.
Thanks to all who replied!