Neighbor hit & destroyed brick mailbox, what is covered?

Our neighbor hit our brick mailbox and completed destroyed it down to the slab, there is nothing left. She filed claim with her car insurance, that adjuster asked me for pictures and estimates, which I sent. Part of the cost is for the detail work that was on our mailbox, and the cost will also go up if the contractor cannot find bricks to match and has to order a cube. That was included and explained in the estimates. The contractors each said her insurance company is supposed to pay to get us a mailbox that is very similar to what we had, and our HOA requires the boxes to be of a certain type. Now the adjuster is offering an amount lower than both estimates, he says they aren't required to pay for the bricks to match our house because the mailbox is at the curb, so its far enough away from the house! He also deducted for depreciation. I asked him to explain that and he couldn't, so he's having his supervisor call me. He said he's never dealt with a mailbox claim before, which I could tell. I don't want to file a homeowners claim on this because our deductible is more than the mailbox, but we also need the mailbox to match the old one as close as possible. What is the typical expectation here, are they supposed to match it or not? Thank you.