How late is the lost and found open in North Station and is there a direct phone number??

They close around 1AM

Lost and found and information are 2 in 1. That's the number you want.

The information desk would probably be what you need. It stayed open until the last train left, which was 1am last time I was there. As for a phone #, download their app and see if it's there, it was an amazing help when we were in town!