So, today it was announced that they knew something was up as early as 12/10:
"The company also confirmed Friday that it found that unauthorized data queries with similar hallmarks started as early as Dec. 10 and continued sporadically until Jan. 27.
...
The hackers succeeded in penetrating the system and stealing customer data sometime after Dec. 10 and before Jan. 27, Binns said."
"The company also confirmed Friday that it found that unauthorized data queries with similar hallmarks started as early as Dec. 10 and continued sporadically until Jan. 27. ... The hackers succeeded in penetrating the system and stealing customer data sometime after Dec. 10 and before Jan. 27, Binns said."
http://www.sacbee.com/news/nation-world/national/article9480...