Is there a pass through from the cabin to the trunk of a 2004 Infiniti G35 sedan?

No, the 2004 Infiniti G35 sedan does not have a pass-through from the cabin to the trunk. The trunk is a separate compartment, and access to it is primarily through the trunk lid. If you need to transport longer items, you would need to fold down the rear seats, but there is no dedicated pass-through opening.