That's a fair point. I try to stick to name brands on Amazon to try to minimize the chance of fakes (Generals, Casio, Zebra for my examples previously) - and the packaging does look like the one I get directly from the manufacturer. I bought two of the same Casios at different times - once from Casio and once from Amazon - and I'm sure the packaging was the same.

But it's one of the things I guess you can't be too sure about. Maybe if we see name-brand prices increase after commingling ends, that can be proof that prices were low due to counterfeits