Section 50B(2) in The Indian Post Office Rules, 1933
(2)If the addressee of (a) an inward foreign packet (or bag) of printed papers or business papers, or (b) an inward foreign insured letter or insured box, addressed "Poste Restante" fails to take delivery of it within seven days following the date of its arrival in the office of delivery, and if it weighs more than 500 grams, a warehousing charge at the rate of 35 paise per day, commencing from the eighth day shall be collected from the addressee at the time of delivery,
