Reaching the other member about a left-behind item
Once a task is complete, the message thread closes; left-behind items go through support. It works in both directions: an item the member left, or an item the other member may have found.
The message is started from Settings → Contact us with the task name and the item. The trust and safety team relays it to the other member and helps coordinate the return; neither member's contact information is shared directly.
An item suspected of being taken rather than misplaced is a different report: the Terms (§15) cover it, and contact goes through the same channel, naming theft. Reports must be made within 7 days of task completion.