When we left home for more than a few hours for vacation, my
late DH always put such stuff in the safe in his den, and really valuable things live in the bank. Even during daylight with family at home, there are people who will sneak in and out without anyone noticing till later. LOCK DOORS AND WINDOWS, get all sorts of hints online and from your local police department.
I'm thinking strongly about another Doberman, all of ours are now at the Rainbow Bridge. They were family dogs and very protective of us all and our home.