Dear Sharad: Someone has misplaced the PPF passbook. After she invested Rs. 70,000, last October, she suffered from a partial stroke which has left her with partial amnesia. She remembers having made the investment but doesn't remember where she has kept the passbook. Incidently, she lives alone, so no one can help. In filing of returns, is it mandatory to supply copy of the passbook? Pls. reply. thanks