to have it, for it to exist, for there to be one
No recuerdo ni haberlo pensado.
I don't even remember having thought about it.
— El Campo de los Sueños (1989)
De haberlo quemado, nunca me hubiera enterado.
If he had burned it, I never would have found out.
— Tres colores: Azul (1993)
Howl y yo podríamos haberlo resuelto.
Howl and I could have solved it.
— El increíble castillo vagabundo (2004)
De no haberlo, no habría encontrado las referencias a mí.
If it hadn’t been there, it wouldn’t have found the references to me.