I owned a brand new 2003 Evo in 2003, as well. You definitely don't see them like this, anymore.
Whoever buys this car, is a collector, and not buying to modify it. These cars still bring a premium and huge interest today, just as a stock Integra Type R's can fetch what it cost new, in stock untouched form. These cars will be the Muscle Cars, of my generation, and as the pickings get slim, the demand and price will shoot up. It's inevitable.
OP- Good luck to your son. I am sure if he holds out, someone will buy it. You're doing the right thing, by posting it on the forums.