Here are some strategies for getting information that might already not be on the web-server (trulia or not).
1. Find the MLS number for the house.
2. Google-search the MLS number with a couple of strategically chosen terms, e.g. MLS 123456789123,
3. The search will bring up some links. Click on the links in order. Some of the links will go to a web-page that does not exist any more. In that case, click back, and in the google search results, click on the little link below the main one that says "Cached" - that will show you the google's cache of the web-page.
That cache might contain information that is already deleted off the web-page.
Also, ask your local agents if any of their brokerages maintains a "Sold" database. Some do, and will give you the URL to a public web-site where you can search all SOLD houses in a zip code, town, etc;.