If you go to the "Spells" tab here on the site, there will be a search option above the lists of spells. Type in either "lost item" or "find item" or "lost something." You can easily find several spells that way, that you can then modify for your own purposes.
Generally used in spells for lost items though are magnets, or magnetite, and then something called drawing powder - which is commonly just confectioner's sugar. Good luck in your endeavors!