Bought a WDCgreen 500GB.But no CD and a cable inside the box?

I recently  bought a WD caviar green internel hard disk [500GB].  But there is no CD and a SATA cable inside the box.Bought from bestbuy!Why is that?

if it was me, i would just take it back to the store and explain it’s not there and return it for another one, i’ve had this happen for some products at retailers before, best buy frys and walmart in years in the past. It happens some times, nothing to get alarmed about.