I can't get the bounding boxes of polygons if TIGER/Line shape files when converting them to GeoJSON using FWTools. The other default information is present and there is no difference between the GeoJSON files created with or without -lco WRITE_BBOX=YES. Here is the command line I used:
ogr2ogr -f GeoJSON myF.json myF.shp -lco WRITE_BBOX=YES