In case of baggage delivery delay, you should inform about it Baggage Lost and Found immediately after baggage delivery of your flight has been an end. Also you should present the rest of the pieces of baggage you have got (if you have such ones) for weighing and setting the difference between the weights of baggage you gave for transportation and baggage you have got in fact.
Searching of your baggage will be go on within 21 days. During this term, you may present the written claim on for delay of baggage delivery. If baggage won't be found within 21 days, you may present the written claim on losses reimbursement for missing baggage.
Claim management of airline will consider the claim and will advise the passenger of the results of its deliberations within 3 months or 6 months if an overseas carrier is involved.