When one has had the great misfortune to have lost something, one can chant the following mantra to reclaim that object:
This mantra was chanted by Hanuman to reclaim Sitadevi from the hands of Ravanasura.
To gain its siddhi one lakha is required but the effect is there just even by chanting this mantra thrice.
namo 'stu ramya salaksamanaya
devyai ca tasyai janak atmajayai
namo stu rudendra yama anilebhyo
namo stu candraya marud ganebhyah