tigerzblood

guys,my question is why do some zr2 come with the logo and some dont?i have a 2001 blazer s-10 4x4 with the zr2 package as indicated on the factory window sticker as well as me entering my vin# on kelley blue book and them listing my vehicle as chevy blazer LS ZR2.but my vehicle has no zr2 sticker on the side .im aware of the chevy tracker model but still i dont know why .anybody know why please help.thanks