Yes, Porter does consider the inscriptional evidence from burial sites (pp.
221-23). Stanton's claim is statistically accurate: 68/70% of all funerary inscriptions
from the Mediterranean world, and 55-60% from Palestine, are in Greek. At some places,
such as Beth She'arim, the percentage is even higher (80%). Perhaps this represents the
level of aquiantance and ability to converse in Greek in the first two centuries of the
CE. Porter cites van der Horst (whose contribution to this field is substantial) as
saying,
if even rabbis and their families phrased their epitaphs
in Greek, there is only one natural explanation for that
phenomenon: Greek was the language of their daily lives.
I would also concur with that.
Adrian Popa