My 68 is a San Jose built car and sold from a dealer in Costa Mesa (near LA, DSO 71) and the original 289 in my car never had a smog pump either and my car is CA built and sold there. So, yes, I would say there were definitely some cars that didn't get the smog pump.
Someone I know used to have a 68 fastback 289 here in CT, and the funny thing is it had a smog pump on it, DSO 13 and originally sold here right where I live in Watertown, CT.
I have yet to ever figure out the smog pump requirements, as it seems some cars *should* have come with them and other that *shouldn't* have required them had them.

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1968 Mustang coupe, Acapulco Blue, 289 2v, C-4, Power Steering.
Hopefully a 1969 convertible or Sportsroof (non Mach or Boss) for next Mustang project
Trying to find my father's 1973 Mustang Grande he bought brand new. 3F04F126773 last known registration and title was in New Jersey, 1982.