Forgotten luggage Tokyo station

Hello, my boyfriend forgot his luggage at Tokyo station.

He took a bus (from the north of Japan) but forgot to take his luggage at the arrival (really long trip and he was really exhausted) we currently have no more ideas on how to find it.

We went to both lost and fond locations in the station, koban, bus information and called the company.

If someone here had the same problem or have any other idea on how we can find it please let me know

Thanks!

by sylin_k