Too bad you can't go back to the dealer and tell them about it. If your state does not require a front plate and they did it anwyay -- you might be able to get a new clip out of it.
When I bought my SVT Focus a long time back -- I bought it in Maryland, a front-plate-state. I TOLD them and they had it in writing ALONG with my Michigan [NON-front-plate-state] not to put the holes and bracket in there...
They did anyway, and I also got a new bumper out of it.