Yes, I do think he is honest. I received a response this weekend:

Sorry I didnt answer before, I thought you might be trying to get the price lowered. I did buy these from the guy you mentioned (I think he was in Brazil, but whats the difference). I also did some more research and found a link to a website in South America with the signs. I went ahead and revised the auctions (and lowered the prices significantly), and I will notify any bidders in case they were watching the auctions. I should have Googled the bidder id before I bought, not just for the signs.

Tom