Yeah, this is a regular problem with KBB and most 'books', They don't allow for ultra-low mileage in their calculations. I've addressed this issue many times in the past. Your car is considered a 'premium' car, a car that can sell for whatever someone is willing to pay for it. When you can find those rare gems, like the the one you have, the asking price goes right up to $30,000 and sometimes above. Most people will not pay that much but realistically a price in the low 20's ($20,000 to $24,000) will get a buyer for that car. It wouldn't be an instant sale and it even could take months to move, but it will. There are always collectors looking for 'showroom' type cars or someone that always wanted a 'new' one but couldn't afford it at the time. Ebay, Hemmings, Autotrader, will get their attention. I deal regularly with collectors and this is the way it works. Any cars with ultra-low miles get 'premiums' added on to retail pricing. Throw out the pricing guides. For the lucky few that can 'steal' these low mileage gems, more power to them, but never expect it.
This is OT but just to give you another example how far off the price guides can be from the real world of collector quality car pricing, I also closely follow the sales of air-cooled Porsches which ended production in 1998. I have for over a decade now since I own one. Excellent examples sell for DOUBLE what KBB and others have them listed for at 'retail'. They are not even close. They just see 'old' 90's cars and price them accordingly with little regard to ownership, desireability and obviously real world pricing.
Enjoy your NEW ride!!