Valuing this car without seeing it is tough.
But, using a bit of common sense dictates this is valued by the company a rather large discount to what they normally value a decent car at.
Saying a car has never been restored, does not mean it has never had paint, certainly the vinyl roof is a worry. Did this car have a sunroof fitted in the 80s? Just a guess.
Condition is the most important, it might be a good car, I will let somebody else make that decision, but we saw what looked like a decent RHD Tiaga CSL sell in a day or two last year for 35k GBP asking price.
The difference in price between a good CSL and a bad one is rightly significant, every guy who has restored a E9 will tell you the costs are larger than even that difference.
if somebody goes to look at it, I might recommend a paint reader or magnet.