Imagine I accepted a package for a neighbor. The content of the box (for an example case, let's say it was a strong magnet) damaged some of my possessions.
Let's say, I placed the box on my computer because I couldn't have known what was inside the box, and couldn't have figured it out without breaking law.
So now storing the box is damaging and/or destroying parts of my computer, just by being placed on it.
Who is responsible for this damage?