The scam is going to be something like this
"Thanks for your interest but I had an earlier reply from someone who wants it. However they have not shown up yet. They were supposed to be here yesterday. If you wire/send me a $1k deposit before he gets here I will tell him he is out of luck. You snooze you lose. Let me know."
Then some greedy prick who thinks he is going to get something worth 30k for 5k sends the guy a 1k deposit and whammo-scammo.