This is a great question.
The prior sales information that you see on Trulia comes from data made publicly available by the county assessor's office. So FSBO or not, any transaction recorded and disclosed by the county should be shown on our site.
Please let us know if you have any other questions.
Bottom line - as good as this site and others like it are - the absolute best place for information on sold homes, pending sales, expired listings and available listings is your local real estate agent. I'm in West Islip.
You can email me at firstname.lastname@example.org