When are short sale leads "ripe" for picking?

[Dan Demers]

I have been looking for short sale leads from a foreclosure lists website. The company I am scouting for believes in visiting the houses in person, as these people are already getting plenty of mail and phone calls. For my first day of visitng properties from the list, I visited the properties that had been on the list the longest, figuring they were closest to foreclosure. These leads were from January. However, most of these were vacant (I assume the website didn't update when properties had been foreclosed on already).

What is the best age of these pre-foreclosures to try to begin a short sale? I was thinking of going for ones from April next, because those are approaching 90 days. Any thoughts? Thanks