Well, some of y'all might get a chuckle out of this faux-pas I did:
I offered a Baldwin S12, in SP, and a Baldwin RS12, in CWR, for sale. One person sent a message with the engine ad linked, paid for it, and I marked it "sold". About an hour later, somebody else messaged about it, without linking to the ad, which was marked "sold", and locked. Since the S12 was gone, and only the RS12 remained, I didn't look closely at what the buyer asked about, marked the RS12 "sold", and sent both engines out. This evening, the second guy told me he had the wrong engine. Now, I have to refund his payment, and give him postage to get it back.
Sigh...[/QUOTE.
I won't laugh, nothing funny about the costs of doing business. Stuff happens, sorry to hear that.
The only people who don't make mistakes are those people who don't do anything.