I have found in the past that there are some listings that do not exist, especially when there is no address listed. Also some of the information comes from a listing feed and that is not always up to date.
Sometimes the listing is sold or under contract but if you follow the link you should be able to see that. In general many agents in the industry do not update their information very swiftly and the hardest and most time consuming part of my job is calling listing agents only to find out a home is sold or under contact or has an offer out.. My understanding is that Trulia has recently updated and upgraded some of their listing processes and therefore it is getting better..What i have also found is that there are many more homes for sale that do not show up here so your best bet is to contact one of the buyer brokers or experts here and let them work with you to find you the most suitable available home at the best price.
Licensed Real Estate Broker & Brokerage
"The Upper West Side's Buyer Broker"
331 Columbus Avenue, New York, NY 10023
Office: 212 721-3301 Email: email@example.com