εἴ με Πλατων οὐ γράψε, δύω ἐγένοντο Πλάτωνες
Σωκρατικῶς ὀάρων ἄνθεα πάντα φέρω. Anth. Pal., IX 358
Why οὐ γράψε? kind of privative?
I’m not sure what your question is. It simply negates (ἔ)γραψε. γράψε drops the augment in imitation of Homeric forms.
i just though that after εἴ what is usually used is μη, unless it is not an indirect question.
Real users of the language don’t always conform to our expectations. However:
I suspect this is in imitation of Homer, so §a above.