This is the nearest police station if you need to report a loss or a theft, for example, of documents:
Additional police stations can be found on the following website: https://koeln.polizei.nrw
Lost Property Office
Citizens’ Center Köln-Kalk
Entrance Dillenburger Straße 25
This is where you can find anything that has been lost while riding public transportation. If you lose anything on the S-Bahn or a regional train, please go to Deutsche Bahn's lost and found office.
Main Station Cologne