Actually, Van Nuys is pretty much a suburb or Los Angeles, so we are both correct, but GM's LA plant WAS in Van Nuys, opened in 1947, demolished in 1998. GM still has a presence there, I believe, a car-testing area.
And the sequence numbers started with the digits "1001", making the vehicle in question number 262 produced.
I know the restoration packets say Los Angeles, I would guess they considered the whole general area Los Angeles, as is frequently the case even now.