I just got into an accident with my 2011 Nissan versa. The bumper is off and doesn't seem to be any more than cosmetic damage. While taking for estimates one of the mechanics said it had been in an accident before because the brackets on each side were different. One was black and the other was silver. The car only had 12 miles when I bought it. So I've never been in another accident. Is this normal or is something off about the assembly of the vehicle?