Recently, the Grand Theft Auto IV fan community received new materials to study.
Reportedly, a user from Edinburgh, where the Rockstar North headquarters is located, was able to purchase an Xbox 360 dev kit that previously belonged to the GTA IV developers.
This Xbox 360 dev kit contained a build of GTA IV that was created several months before the game's release.
One of the findings was a ferry - several images of the model were published online: