Unaccompanied baggage rules permit conditional application and grant customs discretion over dispatch and prearrival landing periods. Provisions govern unaccompanied baggage: the rules apply to baggage in the passenger's possession abroad dispatched within a prescribed period after arrival, subject to extension by the Deputy Commissioner or Assistant Commissioner of Customs. Unaccompanied baggage may land before passenger arrival within an initial prearrival period, and customs may further extend that period for recorded reasons where the passenger was prevented from arriving due to circumstances beyond their control, such as sudden illness, natural calamity, disturbed conditions, or transport disruption.