Perhaps not intentionally, but it does happen. I am particularly amused when both coins involved in an accidental switch are found like in a case of a particularly rare Early Date Large Cent (1797 NC-7). It is obvious that the coins were switched between the time they were attributed and graded and the time they were packaged in the PCGS plastic tomb.
Mixing up labels is NOT switching coins. If you want to make bigger accusations than that than PROVE IT. Otherwise just more sigh
Just step back and take a deep breath. Switching coins is a larger set with intentional and unintentional subsets. Jumping to the conclusion that any acknowledgement of unintentional switching is an attack on the integrity of the TPG is an illogical reach. I have problems with TPGs concerning their ability to be expert in so many disparate branches of collecting. I have seen numerous errors in basic attribution identification even over and above mixing up labels in my own area of expertise. But I make no claim of a lack of integrity other than a claim of expertise where there is ample evidence of a lack of such expertise. Now fire away if you choose. But it won't change my experience in my area of expertise and TPG shortcomings.
https://www.merriam-webster.com/dictionary/proof If there is confusion with that by all means ask for clarification
Are you familiar with Boulian Logic? I really helps one to grasp the difference between what logical statements you can and cannot make about grouping.
Do you realize you're asking for proof of an accusation not being made? At least not by me. But if you want to see a mistake, here's a couple for you. This is a 1793 NC-6 which I identified. It has been written up as the lead article in Penny-W and you can follow it's progress on the Attribute This thread in US coins.
You specifically stated that switch coins highlighting in bold when I said they don't. Wrong label isn't switching coins for the second time, nor is a mistake. It's astounding the accusations that have been thrown around in this thread
Once again, I question their competence, not their integrity. You have a very narrow view of what switching is and I have a more comprehensive view. If we can't understand the differences in how we are using the terms, there's no hope of any resolution. It's like the political factions we see today and which are taboo on this board for just that reason.
If putting the wrong label on the holder is not a mistake then you're implying it is done on purpose? Prove that! This thread is absurd.