Has anyone risked a "too good to be true" purchase online, and had a positive result?

[Fastball]

Interesting thread because I will admit I did this very thing once a while back. However, up to this point I haven't put any effort into determining if it is authentic. So, upon disclosure I welcome any suggestions or help, or perhaps feel free to laugh. There was an auction on eBay that I saw close to the end that was selling a an original tintype photograph of Cy Young. There was a letter of provenance that said it came from his estate. I have no idea how to prove if the picture is really Cy Young; but, I thought it was cool enough and so I said what the heck. I don't have the picture here with me but can post it later. The truth is still yet to be determined or perhaps it's one of those cases where you'll just never know. But I even though I knew it was likely too good to be true, I did it anyway, but rarely do that.