We have a a couple of things "walk off" before. Small items out of my husband's shop. One was a guy who came by to look at a bandsaw he was selling. Another was a neighbor who came by to visit.
We are always in the house when a service person comes inside. We don't have medicine cabinets in the bathrooms, only thing in the linen clost is towels, a OTC meds, bath items. All important stuff like prescriptions, my purse and firearms are locked away in a room they don't need to be in.