While scrolling through the S.A.F.E.R Year Books since 1997, I realized there are so many missing cars. Where are they?

Mark Lento's #7
Bobby Wallace's #19
Knuckles Nunziatta's #2
Rob Nunziata's #64
Ralph Tasso's #3
The Late John Zell's #10
Tom Ferrara's #42
Al Wagner's #55
Lou Wagner's #36
Keith Tirripicchio's #41
Larry Caruso's #40
Ken Darch's #3
Chuck Hlatky's #60

Just to name a few...