Lost phone

Hello!

My cousin lost her iPhone at Gouda train station on Friday 26th of April. We were able to track the phone and it showed that it was at the station in the lost and found container. It says we have 5 days to collect it however, when we got there, the NS employees said that it's already in the lost and found container and they don't have a key for it so we will have to wait until it gets sent to Utrecht for processing. We then received an email saying the phone has not been found. Kindly advise what to do from here? Can I contact someone in Utrecht or should we just wait it out? 

Thanks!