Crash Location as described by : http://www.1af.acc.af.mil/shared/media/document/AFD-100208-032.pdf
As found on Google Earth, it appears to have crashed north of Interstate 8 and east of Highway 67 between San Diego Country Estates and Alpine, in the mountains west of a lake known as El Capitan Reservoir, near Rock Mountain, at the below coordinates
32 56N 116 48W December 24, 1969 Cessna 182 N42622 White/Blue
I believe if the registration is not reserved by the owner or renewed and it expires, the FAA may register the number to another plane, I have found that they usually list the prior aircraft information, but not this time. According to the FAA site, the current 182 had the certificate issued on 06/25/2009, and they wait until 5 yrs have passed.
Corrected and thanks for the info. I guess I was trying to type too fast
Walt