I agree, it might be how he is getting it out there for people to know it is for sale, usually someone posts those kind of listings and it seems no one heard of this until now.If it’s been stored properly and has all documentation there is no reason it doesn’t get 24k or even more, more meaning in this market.
There have been uber low mile SS’s(typically an 87’ Aero or 87-88’s) crossing 30k and that was 5-10 years ago, the last 1-2 years prices/inflation whatever the reason they’ve shot up.