I don't really see this particular accident being a worthy contender for diminished value. That's usually what happens when a car takes a big impact that costs over $10k to fix, like a good t-bone.
I recently lost a mirror fight with a Ford F-150. I underestimated his extended trailer mirrors. He was waiting to park and I passed him on the left. My right mirror got decimated by his left mirror. $1703.69 CDN to fix -- new mirror, passenger window was replaced too because it was scratched up from the mirror impact, and the new mirror had to be painted "Ford black". My first at fault accident in my life, and it was just dumb -- still was getting used to a new big car. My last car was a much smaller Honda Civic. His mirror had a tiny chip in the plastic and it was a strong rigid mirror.
I had my car at the body shop the same morning I did the online filing of a claim for an estimate. They ordered the parts, I dropped it off two days later, and picked it up later that day, back to new. By then the claim was sorted. I paid my $300 deductible when I picked up my car and all was done. And the body shop that my dealer uses was fortuitously walking distance to my work.
That accident was a really crappy day. It was the first major snow in Vancouver and traffic was hell. But this accident had nothing to do with the weather and it happened 1 block from my office.