2004 Tahoe with Z71 package

Hi,
I bought a GSA (Government) 04 Tahoe, and was wondering how can I tell if it has the Z71 package? I looked in the glove box and saw the code z71 amongst others. I know it has skid plates underneath. It is a 5.3L V8 Flex Fuel 4x4. I got it cheap so I am asking cause I'd like to resell it with its actual options.

If you could, email me a reply!

Thanks!