I got $1800 - $500 deductible - $100 salvage for rear end damage to my 240D w/ 2 existing dents, leaky motor, worn interior. Not what I wanted, but more than I'd pay for same & knowing what I know now and where the market is. Woulda got more I expect if it's greymarketness hadn't made it hard to value.

I think best is to have a documented value & rationale for same, other's have mentioned agreed value insurance.

Also, have it detailed before you have the estimate done. If it looks dented & sharp in their pics, It'll be easier to argue for a higher value than a with dented & messy car. I'm sure this mistake cost me some coin.