Weber Customer Service will definitely take care of this for free. Call 800-446-1071 anytime day or night.
The issue is not so much additional chipping as it is the possibility of rust. And don't feel bad, this happens more often than it should because of the packaging used by Weber.
In the meantime, fire it up and start cookin'.
Regards,
Chris
P.S. Order a spare set of legs and hardware for the chipped bowl and you've got a portable backyard firepit! /infopop/emoticons/icon_wink.gif