I've got mine. Has the exact build date on it. 3/4/04. It has a bunch of codes and spanish on it so I'm not sure what it says, I was actually trying to find out if the Z-66 still has load leveling suspension like my '02 did. That feature isn't listed on the Window sticker.
Mine was in the center console.
However, I accidently threw it away and went to the dealer and they printer another one for me from a website that they use.
Found mine in the glove along with tire warranty and such. Just wish they would replace the ink in their printer, have to use a bright light to try and read it.
ah so that's what that was! found mine in the console when i bought it almost two years ago.. had no clue what it was, but figured it was worth keeping..
The only thing I remember seeing was some printout of emmissions testing on a small sheet of paper (from a roll printer). And I have the window sticker. I've saved that from each of my last six vehicles purchased new.