These are easy remedies that will help you to regain an object that someone has failed to return.
Pick a convenient time of day when you will be able to sit undisturbed for five minutes. Use the power of your will to bring the object back to you. If your will is strong, the thief will begin to feel uncomfortable, and will finally bring the missing item to you.
Another method is to place an iron nail on a window-sill. It should be pointed north, south, west, or east, in whichever direction the person who has the object lives. Simply will the object back every time you look at the nail. When the object has been returned the nail should be buried or restored to the tool kit it came from.
Another Romany remedy is to place a rose beside an object similar to the one that is missing. Love, symbolized by the rose, will prick someone’s conscience and the object will be returned. Because you want the person’s conscience to be pricked – be sure the rose is NOT a thornless variety.
From: The Good Spell Book