it was at $317 on the day of the outage and now at $278.5. A ~12% drop. You're right, not much of a drop for such a large outage.
This even is not even showing on any financial news site. I'm still hoping it does and the stock goes down because I place an option order yesterday betting that it goes down by next Friday. Seems like it won't now but the risk was worth taking in my book.