Hey I went to the local RedHat offices a couple weeks ago as well
I didnt get much as far as "Swag" goes - but i did get a branded reusable fabric bag, a branded lanyard, and this branded thing you stick to your phone case to carry your bus card/cc or whatever. Oh and a few sheets of stickers with various logos and motto's on it 
It was a very interesting visit.
What floors did you get to check out, and did you end up eating at there ridiculously overpriced cafeteria? (Assuming you went to the office in Raleigh)
