I would say as little as possible, actually say nothing other than the facts of the accident and only if asked. My wife is an insurance estimator, property damage residential and commercial, she can pick stuff out no one else would see, been doing it 30 years. It's funny because she was complaining over the weekend about someone who was trying to get all new flooring saying it was really new and she knew upon seeing it, the pattern and mfg'er, it was @20 years old, needless to say because he lied she depreciated the crap out of his lose and told come up with your receipt from 2 years ago and she'll reconsider her estimate. All he's done to date is complain to the adjuster how unfair it was.
Since it's such little damage they may not really look too much and see if it's been removed etc.. Good thing there's no isurance report etc and the back bumper has nothing to do with the front so if they bring that up I'd say so what.
Yep the body shop can fill and smooth the dent but if it's big I'd replace it.
I'll ask some friends if they have any recs on any shops out that way or El Cajon area, grew up in Mission Bay area but live in OC since the late 80's.