There were alleyways and roads bordered by teetering piles of broken and damaged furniture, stowed away, perhaps, to hide the evidence of mishandled magic, or else hidden by castle-proud house-elves.
Harry Potter and the Half-blood Prince
I have some difficulty understanding the part in bold. It seems to me that it's saying the broken and damaged furniture was stowed away to hide the evidence of mishandled magic and if it's not done so, the castle-proud house-elves would hide mishandled magic. Is that what it's saying? Does 'castle-proud house-elves' mean the house-elves who are proud of the castle?