I promise not to re-open the whole AFCI soap opera
You may be correct ... At least here, with our minimal humidity, nearly every non-approved device I removed looks just fine. Nearly all are old enough to possible be original (70's) devices.
I sure am glad I have the aluminum rep at every IAEI meeting, to assure me that there's absolutely nothing wrong with aluminum wire.
Of greater concern is that many of the undersized ground wires (conductors are #12, grounds are smaller, maybe #16 aluminum) are broken at the crimp .... making it difficult for me to attach them to the receptacles. Yet ANOTHER reason to GFI the place.
