Costs of marten damage

Dear Motor-TalkHe, in this thread I had asked for opinions on the “age state” of a V70. Now it becomes a bit more concrete after I had my brother-in-law have the car looked at (he lives in the corresponding city). A point that is still open is an unrepaired marten damage: the MArder has apparently caused a proper chaos in the insulation layer between the engine and passenger compartment (see picture). My question would now be with which costs to calculate for the repair I can’t figure out if it’s a few euros for the insulation material and a working hour, or if it’s something bigger. The info would be important to me so that I know how to negotiate with the seller/must. Oh yes, and still the question of what effects it has to continue with this damage without repair. Thanks for any information UL