If the insurance people reference it as an "S" then it seems more likely that it is.
I don't know what the spec' for a '97 "S" is beyond the Showas and brake. I would have expected to see an Adjustable Ohlins with remote reservoir on the rear to match the front.
Carbon mudguard and hugger normally adorn the "S"s.
You might even find that the rear brake has a floating caliper?
Rubbers on the footrests might be another clue.
Your front calipers look right for '97, but at the top of the forks there are remote reservoirs and a speedo/tacho nacelle which I think I am right in saying came later than '97?
Darren seems to be a font of knowledge on these things, maybe he could confirm
Regardless of whether it's got all the original equipment or not it's still a crackin' bike and you're doing a great job...
