I would do two things. First contact the owner since you know who it is and talk to them directly about this matter. If you are to find that this is a scam, I would call the police and let them know what is going on. They will direct you to te proper department to handle this. If you are suspicious, there is a good chance you are right about your suspicions. There are a lot of scams going on right now on this site, Craigslist and others. Be cautious and don't send money to anyone you don't know. Meet them at the property for viewing and with full verification of ownership.
Your Castle Real Estate
My Seller reported four rental prospects knocked-on door inquiring about rent. Two claimed they found the for-rent posing and phone contact on Craig List, one on Trulia.
I suggested my Seller let these folks know this is a scam, do not send anyone $, and suggest the "scamees" notify the posting site of the scam.