Musannaf Ibn Abi Shaybah 31702 — The supplication when something

Umar bin Kathir bin Aflah said that Sayyiduna Ibn Umar (may Allah be pleased with them both) used to say concerning a lost item: "Let him perform ablution, pray two voluntary rak'ahs, recite the testimony of faith, and say these words: 'O Guide of those who have gone astray and Restorer of what is lost, return my lost item to me by Your might and Your authority, for it came only from Your gift and Your favor.'"