Hi Rhys, Although it is not possible to retrieve Sent surveys that have been emptied from the Sent folder, it is possible for the survey creator to enable the Inbox using Survey123 Connect which can be setup to allow you to re-download the surveys which you have sent, edit them, and re-send. More information related to the Inbox - Prepare for editing existing survey data—Survey123 for ArcGIS | ArcGIS Best, Brandon
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