Did they contact you? If yes, it's a scam.
Did they suggest prices that are too good to be true? If yes, it's a scam.
Did they request money for "advertising" (more than a nominal amount), "escrow fees", "taxes that must be prepaid", or similar -- even if they promise to refund your advances from escrow? If yes, it's a scam (if not, wait a while, they will).
We see these inquires all the time. The typical pattern is that once they have your money, there is no buyer or renter and you never hear from them again.