CSC finally sent notification that they've received my RFE packet today. I sent it 9 days ago, priority mail, so they should've received it 4 days ago, minimum.
In my mind, I have this image of one poor guy in the mailroom, sorting and delivering thousands and thousands of letters and packets. I'd feel more sympathy if it wasn't my future on the line!
Anyway, here's to hoping CSC will get a move on and get my I-129F processed soon!
Best of luck to all.