Return Owl.
No, it's not that easy unfortunately. We will be able to replace most of it but some of it was one-of-a-kind. His collection was nearly unaparelled in terms of the unique books it held. But there will be new unique books to find and purhase. I wish it did not trouble him as it does.
The kind of magic you are describing is idiotic and an insult to magic as a whole. It is the reason McKinnon and her friends are going to lose this war. No offense is intended by this, but if the Dark Army came charging through into my home, I would be casting as many killing curses as I could send from my wand. Anything less is pathetic.
For your sake I am glad they are such miserable wizards. Were you able to get your nose healed properly?