No, a 1955 Ford F-100 VIN (or its equivalent, as VINs as we know them weren't standardized until much later) wouldn't be found anywhere else reliably. The information plate (often called a "data plate" or "identification plate") containing the vehicle's identifying information, including the equivalent of a VIN, was typically located either on the driver's side doorjamb or the glovebox. The location varied slightly depending on the trim level and body style, but it wasn't placed elsewhere systematically.
While it's *possible* that a previous owner might have marked it elsewhere, this would be unusual and wouldn't be a reliable place to look. Your best bet is to meticulously check the doorjamb and the glove box. If neither location has the plate, the vehicle's history might be harder to trace.
