What should I do if I find something found at the Totsuka Ward General Government Building?

Totsuka Ward General Government Building (underground parking lot, Totsuka Station West Exit 17th bicycle parking lot, 1st floor 2nd traffic plaza, 1st floor store, 3rd floor restaurant, 3rd floor locally grown and consumed PR / direct sales corner, 3rd floor multi-purpose space, 3rd floor child care support room, 3rd floor information corner, 3rd and 4th floor citizen's cultural center, 1st floor 1st floor 1st floor 1st floor 1st floor 1st floor 1st floor 1st floor 1st floor Phone number administration service corner, 1st floor 3rd floor 1st floor 1st floor 1st floor 3rd floor 1st floor 1st floor 1st floor 1st floor 1st floor 3rd floor 3rd floor 3rd floor 3rd floor Upon notification, please fill out the form with required items and keep it in the Central Administration Office for a certain period of time.
If the owner of the found item cannot be found after storage for a certain period of time, the found item will be notified to the police in the Central Administration Office.