Lost backpack in IC 1413

Hello, This morning at 3am i took a train IC 1413 from Utrecht with a stop to Amsterdam Centraal to Rotterdam, sadly i forgot my bag in the train where i went out of the train for the Amsterdam Centraal stop. I contacted NS at 4AM to see if the staff can find it and they said nothing was found when it landed to Rotterdam (there was multiple stops before). I asked them for the camera but they said i should speak to the police about this but they dont want to. Im a french tourist and im not in Netherlands anymore, please what can i do? It was a blue eastpak backpack with a small cartoon keychain, inside there was my wallet with ID and debit card, and a bunch of souvenirs and a figurine box and a shirt, all of these count a lot for me and losing that really made me sad today, please i want to do anything to find it. I already made a report online through the NS website. Im still waiting and browsing ilost.co to see if theres anything there.