Steve,
Exceptionally low mileage cars that have been properly maintained needing nothing at all that are essentially ready for either NCRS flight judging or Bloomington Gold often command significant premiums over over other cars.
There is a small segment of those seeking ZR-1's, that only want "perfect" cars and will not accept anything less. some of these may never drive it much, while others will drive it, but they want to start out with a "new" car. To both groups, the premium paid, is well worth the quality it buys.
As time has passed, 95's have demonstrated the ability to lead the pack in terms of value, as the final year of almost any series of Corvette has done.
While Ruby's were the largest of the production run in 93, they have managed to still excite some buyers. Some will pooh-pooh that and say it is simply paint and nothing more, others consider it to actually be more.
Your friends car, with less than 2,000 miles falls squarely into the ultra low mileage category. It also suggests that the car was not simply mothballed, and now requires thousands of dollars of work to bring it back, but rather is darn near what it was when new, and performs the same today.
Coupling that with the Z25 optioned 93 would warrant a premium over the typical price structure.
Once properly prepared for sale, which likely would take very little, your friend's car would not be outrageously priced at $50,000.00.
While some will guffaw at that, keep in mind that there were only 245 Z25 ZR-1's to begin with.
Begin breaking them down into mileage segments, and there cannot be many under 2500 miles.
This is one of those very few.
It will take time for the right buyer to find it, but when they do, they will want only such a car, not simply one close to it.
While I can own a home "near the beach" for one price, there are only so many beachfront properties available, and they command a dramatic price increase.
While not at that scale, the same can be said for ZR-1s, and their low mile truly concours examples that are impeccable in absolutely every respect.
Those cars are truly rare and will always be the upward outlier in any pricing model, and the ones most sought after by those discerning buyers that only want the very best.
Marty