This number came up in a craigslist add for Boston Apartment for vacation rental.
Listed through owner "Nilda Rivera of Bridgeport, CT.

 Guy on phone was shady, hardly spoke english.  I was 2 clicks away from sending $ western union until I googled Nilda Rivera and found all these SCAMS through Craigslist attached to her name.

Good luck to all.  I'm sticking with VRBO.com for vacations.

Listing response was as follows:
"I'm sending you booking and agreement form.You are to complete it with
the necessary details and send it back to me so I can pencil you for
the chosen dates.
The owner of the apartment is a widow and right away working in
Connecticut. I only manage the apartment for her.

You should  transfer %50($350) of the rent fee plus the refundable
security fee $200 to her via Western Union.. OK you can complete the
transaction on www.westernunion.com with your credit card or visit the
nearest western union outlet near you to transfer the deposit to her
and after you have that completed, get back to me with a scanned
western union receipt or payment confirmation as prove so I can
finalize reservation, and issue you reservation confirmation along
with your receipt of payment. It is very important for you to have the
receipt printed out and hold it along when you are coming.

Here is her info to transfer the payment to her."