Blade Runner Roy Batty - Inception Date

While reading all of the great articles today about this being Roy Batty's inception date: 

Julia alexander's @loudmouthjulia article at Polygon.com
Scott Collura @ScottCollura article at IGN.com
Rebecca Hawkes Beckie_Hawkes at The Telegraph

I was reminded that none of us here at DeviantArt will ever forget that day four years ago when a mysterious communication from an untraceable source arrived on our doorstep. It turned out to be an unknown audio recording of a blade runner’s “Voight-Kampff” test-interview with Roy Batty shortly before his return to Earth from the off-world colony on which he led three other replicants in a murderous rampage and successful escape attempt.

This was proven to be the actual  “Final Testament of Roy Batty”.