Did they recap it? Normally capacitors are the first to go so a lot of old computers have have them replaced least they leak and damage the board
https://en.wikipedia.org/wiki/Capacitor_plague
Even equipment from the 1950s rarely have to have their capacitors replaced, though sometimes they have to be "reformed".
For most things I’d expect there to be no difference between the value of a computer with original caps _and no damage_ and one with recaps _and no damage_, because the buyer is going to recap anyway. For this Apple I, which is a museum piece rather than a hobby piece, I really don’t know if that holds.