Follow these steps to claim your missing baggage from KLM. First, make sure you have your travel information, baggage tags, and a description of the lost items. Please provide these details to KLM customer care at +1 (888) 362-0647. A person will assist you with the claims procedure and provide you with a reference number. Then, either at the airport or online, fill out a Property Irregularity Report (PIR). Keep the reference number close at hand. KLM will trace your luggage and keep you updated on its progress. If the baggage is discovered, they will arrange for delivery. If you do not, you may be entitled to reimbursement under their policy. Keep in contact for regular updates.