01
JR trains & Shinkansen
お忘れ物センター
Who to call
Each JR company runs its own lost-and-found center. The item stays with the station first, then moves to the police — calling early catches it at the first stop.
Have ready
Date and time, line or train name (e.g. Nozomi 27), carriage and seat, the station you got off at.
日本語 onlyNearly every JR line is Japanese-only; some ask you to spell out details over the phone.