Reducing the 'transparency' and increasing the 'reflection' and reducing 'roughness' will increase 'shinyness'
Effectively creating it more 'Mirror like'.
PS You may not have all materials (textures) installed
see my Autocad tips tip 3, for help on this
PPS I have mirror material tutorial here www.autocadzone.com on the main page, Undera Autocad tutorials, 'Mirror'
PPS I uploaded it for you, it is not HTML but a corel file saved as *.pdf.