I’m curious, how do you know that you were the first person to respond? I mean, I understand that it feels that way because he didn’t mention other buyers up front, but perhaps he was wading through replies when he first responded to you and didn’t know he had an earlier buyer in line?
I’ve bought 2-3 non-local pins, and for the one that was furthest away, I responded to the seller within 5 minutes of the posting, sultanate some ridiculous time like 2:30am. I heard later from a friend that I beat them out by maybe 10 minutes in reaching out. In my DM, I was very explicit that I intended to buy, and that I just wanted confirmation of the represented condition to seal the deal. I’ve had other dialogues with potential sellers where I was much more on the fence, and I wouldn’t perceive it as a lack of integrity if they were showing it to other people at the same time since I never said point blank that I was going to buy their pin.
I feel like saying the seller didn’t act with integrity is based on some assumptions that may or may not be true. I’d personally want to think the best of sellers until I had incontrovertible proof that they’d acted in bad faith.