NBA League Pass Blackout Question.

I live in Irmo, SC and my zipcode is 29063.  I just got Direct TV a few days ago and ordered NBA League Pass.  I'm still confused about the blackout situation.  I get that if it is played on national television or locally then it won't play on the NBA channels.  But I tried watching a replay of the Warriors @ Lakers game and it was blacked out.  Why is that?  That game wasn't playing locally or nationally yesterday so why didn't I get it?  Any help would be appreciated.