The olive green Fishbone backpack was identified as Tristan’s due to a reparation seam.
There was a map of Germany in Czech and a blue garbage bag in the backpack. Czech workers lived close to the site at the time, building railroad tracks for the Intercity Express (ICE). Subsequent police investigations in Eastern Europe, for instance in Prague television, led to nothing.
Tristan had his backpack with him at the time of his murder. The offender emptied it at the scene of the crime. Tristan’s school materials were strewn all around the southern entrance of the Liederbach tunnel. The perpetrator might have taken the backpack to transport some parts of Tristan’s body parts which he had removed. But this could not be proven beyond doubt.
The backpack could have been left where it was found by the offender or another unknown person.