/usr/lib/x86_64-linux-gnu/libIceBox.so is in libzeroc-ice35-dev 3.5.1-6.4ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libIceBox.so.35
/usr/lib/x86_64-linux-gnu/libIceBox.so.35