It's hard to say. He recorded the album Ready to Die (released 1994) and then Life After Death, which was released very shortly after his death (1997) but was fully recorded and mastered at the time of his death, so he definitely recorded that one too. But his album Born Again was assembled from unreleased verses that he had recorded and put to beats by producers and featuring other rappers. So while every song has a new unreleased Biggie Smalls verse, he never had a say in which verses they used, or which other rappers were featured with him. So the answer would be 2 or 3, depending on your view.