Presumably, as you avoided the question, you have NEVER seen one wired differently?.
Boy, you just don't let go, do you. I do not live on ETO. I was out at my farm. We are having a beautiful, early Spring day.
Direct to your question, yes, I have wired speakers in my homes -- maybe a dozen or two at most over the years. I made no effort to inspect speakers wired by others. I found fulfillment in life doing something I believed was more important.
But I don't see why that is pertinent to your claim that there is a firm standard for how speakers are labeled. If there is such a standard, surely someone with your great experience wiring speakers should be able to find it.
John