Wherever the baggage is delayed by the airline, they are allotted 21 days to find it and return it back. In the meanwhile, the airline covers the emergency expenditure that might incur because of the unavailability of the belongings. In case the airline is unable to find the baggage within the stipulated time, it would be deemed as 'lost baggage'. You can claim for compensation in that case.
Usually, airline asks you to list down the missing items. When required, produce as many receipts in original to ensure easy processing. File a claim for the missing luggage at the airport desk or send them an email on their official email address for the claim.