Battle Background

This info here is probably from one of the documents you've looked at already, so I doubt this will help you but just in case... I mean, it seems to indicate what you might be looking for anyways:

1. 270200 27034F DATA No "Battle Background graphic/data bank selection and palette (3 bytes Graphic Packet, 2 bytes Tile Assembly, 1 byte Palettes), 56 Total" 3/19/2003
2. 270350 27184F PAL No "Battle Background Palettes (168 Palettes, 16 colors each)" 7/16/2002
3. 271850 271A47 PTR No "Pointers to Battle Backgrounds graphics (168 elements, 75 used)" 7/16/2002
4. 271A48 271B27 PTR No Pointers to Battle Background tile assembly (relative to 270200) 7/16/2002
5. 271B28 27ABE6 DATA Yes "Battle Background tile assembly (32x19 tiles (except Ghost Train), 2 bytes per tile)" 7/16/2002
6. 27ABE7 2964FF GFX Yes Battle Backgrounds Graphic Packets (48 packs) + 64 wasted bytes 3/19/2003