In Luxembourg, you can file a complaint at a police station or the Public Prosecutor's office of your choice. In some situations, you can also file a complaint with the Police online.
The following are eligible: thefts (wallet or purse, luggage, handbag, bicycle, phone/tablet, computer, computer medium, camera, jewellery) with an unknown perpetrator, during which nobody was injured and no violence was used and for which there is no usable material evidence, and cases where fuel is stolen from a petrol station.
This procedure can only be used for actual incidents. Any misuse is punishable by law.