Search for a lost item systematically

For [LOST ITEM], [LAST CONFIRMED USE] and [PLACES VISITED], build a search grid ordered by probability and effort. Distinguish places physically checked from places only remembered, assign each zone a check method and record who checked it and when. Include a call list for venues and a stop point for sensitive items such as keys or identity documents. Do not claim a location is certain from memory or instruct entry into unsafe spaces. Check that the search does not repeatedly revisit the same spot while likely transfer points remain unexamined.