Will police confiscate my $300?

Hey guys. Long story short I was hit with a marijuana distribution charge. This went down during a traffic stop and my car was towed later on and they’re not releasing it yet because it is being searched again. I assume this is mainly for inventory reasons, and that if they find more narcotics, it will be used against me or whatever. There may be a small amount of money ($300) hidden in a book in the glovebox.

If they find this, and I imagine they will since theyre supposed to document everything in the car, will the $300 be returned to me or assumed to be part of the drug trade?

Keep in mind the vehicle is registered in my fathers name, whose a renowned doctor on the east coast.

Thank you very much.

EDIT: side note, they kept asking me if the car was paid off, what importance did that question have?