Reason #1. you have not waited a sufficiently long time for it to appear
Reason #2. It is on Trulia but not where you are looking
Reason #3. the listing agent advised the seller that placing their home's information on advertising websites like TRULIA and ZILLOW forfeits the rights of the home owner to control their homes information. Predators of any kind will be able to see the interior of your home. These advertising websites reserve the right to use the home data in any manner that suits their purpose. If #3 is the reason, this listing agent has DEMONSTRATED UNCOMMON concern for the safety of not only the seller but the buyer as well.
Ron, if you are the SELLER, you should thank your REALTOR profusely. The long enduring perils and hazards that result of losing control of your homes data, creating risk, may have long enduring liability for the seller, their agent, the brokerage involved on both sides.