Both have no AA filters. I searched.
Only the dust shaker that is also the UV-IR cut filter (a mere 0.6mm thick) is present.
The NEX-5 has a stacked/glued AA filter/UV-IR/dust shaker (Peter Ganzel showed the thickness to be 1.1mm).
I don't know about the NEX-3 (or the new F3).
The NEX-7 has a separate AA filter (0.5mm thick) and the UV-IR/dust shaker 0.6mm thick).