How can I mark an AirTag or a third-party item as lost in Find My?
You can mark an AirTag or a third-party item as lost in Find My by following these steps: Open the Find My app and tap on the item that you want to mark as lost. Swipe up on the card that appears at the bottom of the screen and tap Activate under Lost Mode. Follow the instructions to enter a phone number and a message that will be displayed when someone finds your item. Tap Activate when you are done.