Question on an expert opinion

My son has driven one on the back. The debt question is clearly with the other. We had an expert report drawn up, which looks like this. Replacement value: 5000,- € Tax neutral Repair costs 4,200,- € incl. VAT Rest value: 1,800,- € incl. tax The remaining value offers are all from the surrounding area. So no further than 30 KM away. The opposing insurance has now corrected the remaining value to 2,300,- € upwards with an offer in the middle of Germany. I was informed that it is normal for the evaluators to only obtain regional offers. However, the insurance company itself has then obtained a national offer. Why is this done like this? Why does my evaluator not also receive a national offer?