I had a suitcase go astray which I never got back so I claimed on my travel insurance. Big mistake.
They wanted receipts for every item in it otherwise they wouldn't pay. They offered about 1/5th of the value. Fortunately my home contents insurance covered the rest but it took about 6 months to get sorted because as I claimed travel insurance first (I thought that was what it was for), the home bods wouldn't do anything until the travel bods had finished.
So if you are going to claim, it might be worth doing the home insurance route first and letting them know that you also have travel insurance. They can then fight it out between them.