I have the most recent "sandblasted" version in silver and it definitely seems like an anodized finish. If you take the back piece off you can see the finish is different than the raw stainless steel and where the two meet kind of looks like a layer of paint. Kind of a bummer since a true sandblasted or tumbled stainless steel holds up so well, but for the price you can't complain. Either way, no big scratches on mine yet.
#1. It's an aluminum box, not stainless steel.
#2. If you can see a separation in the finish then it's either paint or powder coated. When you anodize you electrify the metal and then completely submerge it in the solution. If it was anodized finish it would be coated the same inside and out.