Unfortunately, that registry has not been updated in several years. It appears the author simply lost interest after selling his own BRG SE. The registry lists 197 cars of a possible 3000 made, but many of those entries are obsolete as cars have been sold, wrecked, drowned (as in Hurricane Katrina), parted out, etc.
I'm trying to update the 2001 SE registry. So far, I've managed to locate another 70+ cars through various Miata sites and many Google searches; I can now account for ~270 of these cars.
If you have one of these 2001 BRG SE's, or had one and sold it, please let me know your Build (Production) number (you can find it here with your VIN: http://bit.ly/zJ2kvE) as well as your Town and State.
Or if you know someone with one of these SE's, please point them to this page.