The supplication when something is lost

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.'"

Mujahid said that Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: "Allah has some additional angels besides the guardian angels, who record every leaf that falls from a tree. So when any one of you is struck by lameness on a journey, let him call out these words: 'Help, O servants of Allah, may Allah have mercy on you.'"