Some were from CCA though. Quess' old Jagd Doga was partially repaired, repainted, and sent out to fight. Not just the model -- that specific Jagd Doga.
I also love Unicorn and the past events. It was great to see the MS in CG and everything as well, and I was always a fan of Katoki Hajime's artwork and designs. It was also neat that if one looked closely and even paused the frames in the right points in Ep. 7; the Big Zam, RX-78-2, Elmeth, Char's Gelgoog, and even Sayla in her Core Booster make cameo appearances. Sayla is even drawn in the cockpit!
http://vignette3.wikia.nocookie.net/gundam/images/3/3e/SaylaCoreBooster.JPG/revision/latest?cb=20140819143202