KLM lost luggage worth >6000€ 7 weeks ago
instagram.comThe airline is not declaring it lost and does not offer compensation. As usual with contemporary customer service, you only get non-answers and it becomes increasingly hard to talk to a human being that's directly involved with your issue.
Sigh, that sucks.
In my experience (which led me to pay for luggage insurance) the airlines are cooperative about loss/damage provided that the luggage is insured with someone else or with a documented value from before the trip. If not — if you tell them after the fact that an absent suitcase was valuable and they're on the hook — they'll drag their feet endlessly.
It took me ten months to give up, gnash my teeth and take out insurance, so if your experience will be like mine you have another eight months of frustration ahead of you. It sucks.