The FBI is warning about a bit upsurge in real estate fraud — especially on land that’s out in the country, and land that isn’t being used. Vacant lots, farmland, pastureland, or any place that hasn’t been developed. Fake sellers bamboozle honest real estate agents into selling, and the real owner may not find out for years that their name isn’t on the title. Here’s a look at the problem and ways to make sure it can’t happen.