Yes, these maps have been official at some point...these are the only two "new" maps recently recovered.
One is the terrain map for Unreal 0.84 and another is the default map in version 0.864n. Exciting isn't it?
http://www.newbiesplayground.net/?wpfb_dl=8215 "SURFACE"
http://www.newbiesplayground.net/?wpfb_dl=8214 "Unreal map from 864n"
Contains myleveled textures in second case due to them seeming unique and not in the previous packages. Surface requires castle1rys (renamed castle1 to keep ut compat)