not actually looking for them... they just happened to be in my area.
A couple in the Sierra Nevada Mountains while backpacking and.... I think 3 in the mountains near my ranch in Coalinga. Note: All were known, not saying I 'discovered them'.
The most famous being Deportee crash made famous by a song from Woody Guthrie, (Arlo's Dad)... of course, he lied in the song saying the passengers, being deported, were not identified or ever named... in truth every one of them was listed in the Fresno Bee the next day.