The check from the guy who claimed to have written it for $1K too much has not shown up. I have gotten a couple of e-mails asking when I was going to deposit the check and make the WU transfer. I have not responded to any of them.
As I had a couple of items to ship that I had sold here, I made a trip to the Post Office on Monday. While there, I spoke with the Postmaster. She smilingly advised me, since I'd already figured out it was a scam, to bring the envelope, check/MO and copies of all of the e-mails that I had recieved. They tend to frown on fraud perpetrated through the US Mail.
A valuable lesson has been learned here.