I also have a Schwinn Homegrown USA addition (made by YETI) with almost no miles on it. The only change from stock was soon after I bought it I removed the White Industries Wheelset and built a custom set with Chris hubs and Mavik 231 Cermic Rims.
The original Underground did not have a head badge. I have a brand new frame that has never been built up that I purchased when they first came out.