Nettos painter fragments at the Getty

I have commented before on the links between Vasek Polak and the Getty (as noted in Chasing Aphrodite).

I was reflecting on some of the other donations made by Polak:

• Fragment of an Attic black-figured neck amphora, attributed to the Nettos painter. Malibu inv. 81.AE.114.30, joins 83.AE.438.

Where did Polak obtain the two fragments? Why were they given separately? What are their full collecting histories?

There are intellectual consequences to consider. Pots attributed to this painter have been found in the Nile Delta, Cyrene, and Western Anatolia. But what if this had been found in Italy?