I'm on the same boat as you guys. I Kickstarted the $65.00 Retail Pack (1 digital key, 1 physical box, 2 total copies) and I'm waiting on the physical box to arrive. Haven't received any shipping confirmation or anything (I'm in California), but I totally understand that these things happen.
I'd really appreciate a second digital key while I wait for the box to arrive so my wife and I can play together.