Rodent damage is common for vehicles that haven’t moved. Think a manufacturers vehicles sitting at the yard. Or a van used for promotional purposes by a private fleet or a sporting event that a manufacturer holds onto - before finally selling it to a dealership at a discount.
Rodent damage will be covered by comprehensive insurance.
Because everyone’s policy is different - you need to check your specific policy.
You know every year when you renew, you get like 10 pages of here are the changes.
So go online and your policy will be there. Or you’ll have a paper copy.
But no one can truly answer you.
But rodent damage is unfortunately an every day occurence - if cars aren’t moving.
Good luck.