LMAO!! Liz, four things...
1). That case was made by Valve, just for HL2 release... That is done by Valve the company...
2). It is made to look like the HL2 environment in the game.. LMAO!! Lots of the objects in HL2 are rusty and old looking.
3). I think Valve is going to like their own game forever. LMAO! Liz, you are silly!
4). The rust isn't real, it is a paint made to look like rust. That paint won't chip off, it is brand new.
Liz, you make me laugh! When you click that link, look at the title above the first pictures. That should explain it a bit more.