It isn't in the TRO 3025 (3rd printing 1987). It is the House Liao sourcebook (pubished 1988), along with the Cataphract-1X. All the standard-tech versions are in TRO 3039 (published 2008), & the high-tech -3L appears in TRO 3050 (1990).
"During the Fourth Succession War, House Davion forces captured many Ravens as they slashed through the Capellan Confederation" (TRO 3039, p.224). I think the key word here is MANY. That's why the concept art is painted in AFFS colours.