* Fuel pump relay: The relay controlling the electric fuel pump is a common part that might have a Bosch label.
* Fuel pump: While less likely to be labeled directly as "Bosch," the fuel pump itself could be a Bosch-manufactured part.
* Other relays or modules: Various electrical components in the car's electrical system could be from Bosch.
To know what a specific box is, you'd need to describe its size, shape, markings (labels, numbers), and location within the trunk. A picture would be very helpful.
