1. This isn't an announcement that our details have been leaked, so much as a reminder that our details are now and will perpetually be leaked, in one form or another by an externalized party.
2. Databases mapping all American households exist.
And they can be pretty comprehensive. Short anecdote but the last time I moved, and before I had updated any address information on my accounts/ID, the first piece of non-forwarded mail I received addressed to me was a credit card offer from AMEX. I still have absolutely no clue how they knew where exactly to send it to me.
That said the cynic in me won't allow the positive optimist within me to win this one. While I do believe there to be many wonderful postal workers I am going to assume that corporate greed is winning out over the kindness and caring of the human heart in this specific situation :(
Compared to Equifax, this is nothing. Why? Because this data can't be used for identity theft, and it's been widely available in downloadable, fully portable form for 2 decades.