Surrender of unspent foreign exchange required within set periods after acquisition or return; different deadlines for cash and travellers cheques. Non resident persons (other than individuals) who acquire foreign exchange under the declaration to an authorised person must surrender unused foreign exchange within sixty days of acquisition; for foreign travel, unspent currency notes and coins must be surrendered within ninety days of return, and unspent travellers cheques within one hundred eighty days of return, subject to any contrary regulatory provision.