When something is lost supplicate with the following words:
1.
اللَّهُمَّ رَادَّ الضَّالَّةِ وَهَادِي الضَّالَّةِ أَنْتَ تَهْدِي مِنَ الضَّلَالَةِ ارْدُدْ عَلَيَّ ضَالَّتِي بِقُدْرَتِكَ وَسُلْطَانِكَ فَإِنَّهَا مِنْ عَطَائِكَ وَفَضْلِكَ
“O Allah, the Returner of the lost, and the Guide of the lost, You guide the lost. Return to me what I have lost by Your power and Your domain, for surely It was Your gift and grace in the first place”.
(Al Hisnul Haseen)
2.
يا جامع الناس ليوم لا ريب فيه
اجمع بيني وبين مالي إنك على كل شيء قدير.
Allahuma ya jami’ an-naas li yawmin laa rayba feeh ijma’ bayni wa bayna dhaallati.
“O Allah, Gatherer of mankind on the day in which there is no doubt. Connect me with my lost item.”
(Fathul qadeer)