I debated whether to mention anything when I realized the two pieces were one and the same. I did not conduct a search for the purpose of embarrassing the poster. But, I decided somebody was bound to notice the fact they were the same piece, and since the photos were already up, I let the cat out of the bag. After all, it let is know with certainty that the object was ceramic, not stone. Remember, the poster never said it was a personal find of his friend. If a guy is looking for "cold" opinions, then just show the object and ask for opinions. Mentioning what you've already been told it is is a form of "leading the witness", or it can be. Don't provide any clues and see what opinions are generated.
It's even possible that it was sold to somebody after the April eBay auction. In which case, my discovery may even be a revelation to the poster himself.
In any event, if it's me I probably mention it's a purchase and that I have an ID for it, but would prefer not to say, so opinions are not influenced at all. But, doing it this way does not mean we start to feel that the poster was pulling a fast one, somehow. On the other hand, if the poster never shows up in the thread again, well, all I can say is I did not set out to embarrass the poster. Still, we would not be going here at all if the poster had said he has an idea what it is, but would rather not say. Otherwise, it's inevitable that some will not think well of the poster for going about it this way.